Have a question? My team and I are happy to hear your questions and get you answers! When you type a question, it shows up not only on that experiment but also here so you can easily find your answer. You'll find question boxes at the bottom of every experiment in the program.

Question: from bac051201 about the Calorimeter experiment :

why did you use capital t throughout the video? I thought that meant temperature. or did you mean the change in temperature, not time?

Question: from jamallwh about the Aurora's LEGO Robots experiment :

Can you please tell me how to make the 12 legged robot with two motors?

Question: from amberrnelsen about the Water experiment :

Our jar of water keeps freezing before we take it out. Do you know why it could be freezing instead of supercooling? We've tried it a couple times but each time the water is already freezing into crystals before we go to take it out.

Question: from frauritsema about the Basic Circuits experiment :

Thank you for your help!

Answer:  Basic Circuits

No problem! When I started, I only had a battery, rubber bands and paperclips for my homemade "battery holder" and I made my own alligator electrical wires from aluminum foil and masking tape! It's hard to say what's going on without actually *seeing* your experiment. You can send me images to my email at [email protected] If you're not sure of the minimum voltage requirement is for the LED, then you'll want to hook up the batteries plus-to-minus, not plus-to-plus, so the voltage increases. You can check out the experiment on "Series and Parallel Circuits" to help guide you through when you should use each configuration. I recommend using those cheap "dollar store" type of batteries (listed in the shopping list) so your batteries have the least chance of exploding, because you're right - if you hook them up the wrong way or with too many other batteries, you might have a problem.

Question: from frauritsema about the Basic Circuits experiment :

Howdy, We were working on this experiment and couldn’t get it to work (we didn’t have a battery case and use electrical tape instead and the LED might have too high a voltage). Anyway as we were troubleshooting I came across the idea of having the wire attached to the battery go across two ends of the same polarity (thus using four batteries). I wasn’t able to do it at my house because I’m not sure whether or not it would, for instance, cause the battery to explode, so I wanted to ask you what would happen if you had the metal part of the wire lay across two batteries? Would it increase the voltage? Ps we ARE getting a battery case and Lowe voltage LEDs... we just got abit excited!

Answer:  Pop Rockets

Take a look at the projectile motion equations on page 3 of the worksheet download. Which equation has only one unknown that you can solve for? (Hint - you may have to put two together if you don't see one that works straight off the bat.)

Answer:  Equations for Circular Motion

Let's see: J = N m and N = kg m s-2 So here's the way we usually write it: 6.67408 × 10-11 m3 kg-1 s-2

Question: from trish_chapman about the Pop Rockets experiment :

I don’t know what equations to use for the frog problems 1 and 2.

Question: from bac051201 about the Equations for Circular Motion experiment :

would the gravitational constant also be able to be written as 6.67*10^-11 joules^2 over kg^2?

Question: from lesheadrick about the Plasma Grape experiment :

super coooooooool !!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer:  Can Insulation Save Energy?

I would try all sorts of things, not just a cooler or a bag. For example, what kind of bag? Brown paper lunch sack, grocery bag, cloth, or thermal bag? A good scientist is always asking questions and then designing experiments to answer those questions. Do let me know what you find out! (Maybe there's a good reason people use coolers instead of bags?)

Question: from apbaine about the Can Insulation Save Energy? experiment :

Hi Aurora, I was wondering if the cooler can be a bag. Thanks - Sophia Baine

Answer:  Newton's Second Law of Motion

Yes, you're right! The energy went somewhere, and with a squishy foam ball, it goes into the squeezing the ball. Try something harder, like a bouncy ball.

Question: from mrsrohland about the Newton's Second Law of Motion experiment :

It works! We try a foam ball---and it didn't work. We think it is absorbing the momentum???

Question: from heidi_newman270 about the Sea Angel: Is it real? experiment :

They are so small They eat sea snails I think it's so cool that they are both genders

Question: from karenketzner about the Electrolysis experiment :

We did fill the tube attached to the negative terminal with hydrogen as confirmed by the popping. No gas was at the positive terminal (no fizzing, bubbles, or water displacement). We repeated the experiment a second time with the same results. We used the alligator clipslike in the video set up inside the tubes. We even tried a third time with table salt that time, still with only hydrogen present in the test tube attached to the negative terminal. No gas formed in the other test tube. We tried using a different snap on clip to the 9 volt battery each time, with different alligator wires each time.The solution was a dark greenish/blue after removing the test tubes. Would 2 double A batteries work bettter, or should we try different electrodes or tape wires directly to the battery instead of using the clips? We tried 2 different new 9 volt batteries, as well as different alligator clips each time. Thanks!

Question: from robertdangelo about the What do you think? I need your input! experiment :

We homeschool . . . "What's great"?? . . . Your unbridled and contagious enthusiasm for science. Distilling complex subjects down to simple easy-to-understand explanations and analogies with illustrating experiments. "Be even better"?? . . . Not sure. Your program is pretty good already. "How do we use" ?? . . . We have two dedicated science days a week. We skip around subjects a bit based on interest opportunities that just kind of come up as a result of going through life and observing. My daughter "Andie" (she writes you a lot) is now eleven years old and is doing middle/high school level work. She has a profound interest in science, therefore I do not need to get her attention. We prefer the meatier, less showy/less playful experiments. We continually miss your special "live" presentations, which always seem to fall on Wednesdays at noon Pacific time. We are never available that day, due to other obligations. Thursday and Friday are our "science days". How about replays?? My sincerest thanks and warmest regards -- Bobby D'

Question: from karenketzner about the Turning Copper Into Gold experiment :

That was a really cool experiment. Thanks!

Question: from jredwitz_ca about the Hidden Magnetic Fields experiment :

Unfortunately the student worksheet & exercises (which talk about creating a compass), do not correspond to the video or reading (which talk about magnetic field strength).

Question: from Aurora Lipper about the Black Hole Bucket experiment :

Yay! Thanks for the update :)

Question: from jma5447 about the Acids & Bases experiment :


Question: from jenjar2001 about the Black Hole Bucket experiment :

Fishing bobbers and weights. I found some today at a Fishing supply store. Thanks!

Question: from Aurora Lipper about the Black Hole Bucket experiment :

Is it fishing bobbers that you're looking for? If so, they look like this and you can find them locally at sporting good stores.

Question: from jenjar2001 about the Black Hole Bucket experiment :

I really want to do this experiment. I’m having trouble finding round, coated fishing weights . Suggestions for other materials to use or places to find them?

Answer:  Burglar Alarm Activated by a Pressure Sensor

Wow - that sounds interesting! Can you send me a picture? mailto:[email protected]

Question: from Aurora Lipper about the Electrolysis experiment :

Can you tell me more details about your setup for the experiment? What kind of power did you use (and how much?), what did you use for electrodes? Also, what was in the solution (amount, etc.)? Thanks!

Question: from serenamae4 about the Burglar Alarm Activated by a Pressure Sensor experiment :

Tried the burglar alarm and for some reason, the light came on when the close pin was open and off when the tacks touched. Don't have any idea why that happened!

Answer:  Rotating Candles

Update - they didn't move it.. it still works! It took a long time for the video to start, though. Try clicking on the video itself while it's "spinning" - that sometimes works to bump it so it starts playing.

Answer:  Rotating Candles

That's strange - the video should be unlocked for everyone, since it's from MIT. Let me see if they moved it again.

Question: from bac051201 about the Rotating Candles experiment :

I have the same problem as Karen Daley. I don't know if I don't have access to this content, but I can't watch the video

Question: from karenketzner about the Electrolysis experiment :

We added 1 TB sodium sulfate to 100 ml of distilled water. The sodium sulfate immediately formed a hard plate on the bottom of the beaker like Shannon Reiter’s comment. We poked at it with a stirring rod for 15 min, and it finally dissolved. Gas is only being produced at the negative terminal, and is only 1/3 of the way full so we haven’t tested it. Do you know why there is no gas being formed in the other test tube? We used the alligator clips from the electricity pack and the battery clip from chem 3000. Thanks!

Answer:  Hovercraft

I've send you a private email. So happy for you and your newborn!!

Question: from victoriahanline about the Hovercraft experiment :

Hi Aurora! Thanks for posting such a fun project! Do you have a place in your shop where you sell the parts for this Hovercraft in one package? I would be more than willing to pay for your time to gather the pieces and the postage to ship. I am at a funny stage right now (newborn and schooling lots of ages) and trying to find all the parts is posing a bit of a challenge. Please let me know! Thank you in advance for your time! Victoria

Answer:  P-Shooter Launcher

Thanks for your email - I've written up my own solution to this problem which you can download here.

Answer:  P-Shooter Launcher

Sorry you are having trouble! Can you send me a photo of the work you've done so I can point you in the right direction? Email me directly at: [email protected]

Question: from jkptexan5 about the P-Shooter Launcher experiment :

Hello, we worked for over 30 minutes on question 3 for the advance student P-shooter Lab and could not figure out which formulas to use to come up with the answer given. Can you help us with this?

Answer:  Mixing Colors

Red and green LIGHT make yellow, just like in the video. What color did you get with orange and green?

Answer:  Lava Lamp

Not without adding an external heat source. You need something to keep the reaction going so the liquids stay in constant motion. This experiment is just for demo so you can see different liquid densities and how they interact.

Answer:  Atomic Facts

Thanks for letting me know - I appreciate it. It's really important to me that my website is a safe and open place for kids to ask their science questions. Let's try again!

Question: from mirzamediha about the Mixing Colors experiment :

we tried orange and green, is that the right combination to get yellow?

Question: from bac051201 about the Lava Lamp experiment :

is there a way to make the lava lamp reusable so you don't have to keep adding salt

Question: from bac051201 about the Atomic Facts experiment :

I would like to apologize for my stupid comments about blowing things up it won't happen again

Answer:  Bow and Arrow Problem

This is in the High School section where we are talking about different forms of energy. The bow and arrow is just an example to illustrate the concepts. Did you mean to access the site from the High School section? None of our videos should be mis-labeled. If you find one that isn't right, do let me know asap so I can fix it. I'll look into this one later today.

Answer:  Special Science Teleclass: Solar Astronomy

Awesome that you are star gazing! And yes, this sort of thing happens all the time. That's actually what hooks a lot of astronomers to keep at it until they find it. My guess is that either your scope wasn't aligned properly, or that you didn't have the right numbers at the right time (since planet position changes rather quickly over the course of the night). You can use "Stellarium" to help you figure out where to point it and be sure of what you're looking at. Here's a direct link (it's free) - you can put it on your phone as well to use outdoors to help you align your scope. https://stellarium.org/ That's the free option. The other way is to "star hop", which means you find something you know for sure what it is, then hop over to something new and verify it. Here's a couple of resources for how to do this: http://www.nightskyinfo.com/star-hopping/ https://earthsky.org/tonight/star-hopping-from-constellation-orion

Question: from bac051201 about the Bow and Arrow Problem experiment :

what did this have to do with a bow and arrow? sorry if this is another mislabeled video

Question: from robertdangelo about the Special Science Teleclass: Solar Astronomy experiment :

Hey Aurora, it's Andie. Not that this is related to the subject of this page, but I have a Celestron C8+ with an equatorial mount. Last night my dad and I were trying to find mars, but when we put in the correct right ascension and declination along with the correct hour angle, mars wasn't there. Do you have any advice on this? Thanks, Andie

Question: from bac051201 about the Elastic Collisions experiment :


Answer:  Elastic Collisions

The previous video in this sequence also involved looking at different time intervals. I must have misspoken about the "last problem" - not sure which one I had shot before this one. Just ignore it! :) I had to create 500+ videos for this section, so you may find little errors like this in terms of where they got moved in the sequence. Everything should be logically laid out and accurate in terms of science. :)

Answer:  Tracking your Treads

Oh, no! Thanks for letting me know. I am updating all the shopping lists soon, so I'll put this correction on the list also. So sorry about that!

Answer:  Acid Test

Sometimes vinegar isn't strong enough (I have found out that it can vary between 2.5-4.5 pH), which is why we use the diluted HCl, but this isn't something we want you to work with. There are other ways of testing the rocks. Is it just the limestone that you are trying to find? If so, you can leave it overnight in a cup of vinegar and compare with in the morning to see if there are any bubbles on the surface. Tkae a photo just after you drop it in, and then again in the morning to compare.

Question: from bac051201 about the Elastic Collisions experiment :

this video has a reference to a "last problem". is that supposed to be what the mislabeled video is???

Question: from Nhasan112 about the Tracking your Treads experiment :

Hello. FYI: the Protractor is missing from the list of materials. We didnt realize until we gathered everything else and started to do the experiment.

Question: from jennifer_rice about the Acid Test experiment :

I have the Washington Student rocks and minerals bag but I am having trouble identifying the minerals in the bag. I have used the field guide but still don't feel confident that I am using the correct minerals. My rocks didn't react at all when I applied the vinegar. Do you have any suggestions on how I can accurately identify the minerals? Thank you! Abigail

Question: from cndbil about the Constant Acceleration experiment :

Thank you. I see it now. Yes we are doing the HS side

Answer:  Soccer Ball Science

Great job figuring out what happened! That skill is going to go a LONG way in science... keep up the good work! (Did I mention that a lot of what we do in science is figure out what went "wrong"... e.g. "differently that we expected"?)

Answer:  Constant Acceleration

That lesson is posted in two places. I noticed you've accessed it from the HS side, so the answers to the questions in the worksheet download are on the last page. If you meant to access it from the K-8 side, the answers to the questions are here: https://www.sciencelearningspace.com/category/topics/unit-2-mechanics/lesson-2-acceleration/acceleration-exercises/

Answer:  P-Shooters

The question is asking how fast did the ball have to be moving in order to get that high? We can't really measure the height accurately or easily, but we can measure time. By timing how long it takes to go up, turn around and come back down, we can figure out how high it had to go, and then figure out how fast it was going to get that high. We can do that all with one projectile motion equation. The equation included is a standard projectile motion equation you'd find in any typical physics textbook, where "f" stands for "final" and "i" stands for "initial". The "v" stands for "velocity" and the "t" stands for "time". The "a" stands for "acceleration" and is a constant value of 9.8 meters per second2 for freefall motion. When we do these types of calculations, we look at just the horizontal component or just the vertical component. When we just look at the vertical component, the ball goes up and then down. So vf means the final velocity (which is zero when it hits the ground - it is no longer moving and doesn't have any velocity. We don't always know how the equation will look with every problem, so we have to start with the main equation and then simplify it from there. (There's a video that explains all the letters and how to use the equation in the Projectile Motion section of the HS level Advanced Physics. I've included this lab for lower level kids because it's a lot of fun to do!)

Question: from jakebrown518 about the P-Shooters experiment :

We are not understanding what the values represent in the equation. Please explain. Is M/S Meters per second? V is obviously Velocity, but what are the sub letters? Why is the formula so complex if it is simply 9.8 X the recorded time/2?

Question: from Aurora Lipper about the Turning Water into Wine experiment :

No, it's never safe to drink something you've made in a chemistry experiment!

Question: from Aurora Lipper about the Zinc Dust experiment :

I am sorry you're having trouble with this! It sounds like there might have some kind of contaminant involved with your process. In any case, there's not an effective way to remove the material from the spoon short of an industrial solvent. It would be best just to discard it and start with a new one.

Question: from themorozovs about the Turning Water into Wine experiment :

Can I drink the yummy

Question: from cndbil about the Constant Acceleration experiment :

Hello. I have the same question Kimberly did. I cannot seem to find the solutions to the Acceleration problems. Please tell me where to look. Thank you

Question: from bac051201 about the Soccer Ball Science experiment :

I'm soooooo sorry!! I had entered it as only sin 38* was over 9.81. oops. ;);)

Answer:  Microscope Lab Introduction

There's an assortment of recommendations in Unit 16 under "Microscope Materials". The bottom LED is a must, and in the past, I've used a flashlight for top illumination at this stage (you'll need something better for college of course). Can you send me a link to the binoc one? I am very curious!

Answer:  Soccer Ball Science

If you're still stuck, send me a picture of your calculations to [email protected]

Answer:  Electric Eye

Did you get it to work? I wasn't sure by your comments which experiment you got to work... :)

Answer:  Ideal Gas Law

Yes, that's right! When a balloon decreases in pressure (the air rushing out), the temperature also decreases. Like an aerosol can - the contents inside go from high to low pressure, and then there's less stuff inside the can decreases the pressure more, which also decreases the temperature. If you hold your hand on the outside of the can as you quickly release the stuff inside, you'll feel it getting colder!

Question: from tntmnm about the Ideal Gas Law experiment :

Does the gas law explain why a balloon feels colder right after all the air has rushed out?

Question: from bac051201 about the Soccer Ball Science experiment :

is my calculator busted??? I got that sqrt 30 sin 38*/9.81^2 = 3.397....; so why did I get a different answer

Question: from bac051201 about the Using Trigonometry with Physics experiment :

I can finally post comments!!!!!!!

Question: from apbaine about the Electric Eye experiment :


Question: from apbaine about the Electric Eye experiment :

My DMM isnt showing any Ohms.What do you suppose i do? (Ian) (9)

Question: from apbaine about the Dimmers and Motor Speed Controllers experiment :

Yes.I set the dial to Ohms,but still no reading.Is the pencil graphite supposed to do any thing? Thanks Aurora (Ian) (9)

Answer:  Dimmers and Motor Speed Controllers

Are you at the part where you're measuring the resistance of a line drawn on the paper? If so, the DMM needs to be set to measure resistance (ohms).

Answer:  Special Science Teleclass: Rocketry & Spaceflight

Have you seen SpaceX's landings? https://www.youtube.com/watch?v=vr_C6LQ7mHc They use rockets to guide it back to earth to land.

Answer:  Introduction to Kinematics

It's probably going to be a couple more months... the new website is built but we're still having weird issues like not being able to log in.

Question: from sonmc132 about the Microscope Lab Introduction experiment :

Hi Im looking for a microscope for my son. I have come across one that has binocular lenses with top and bottom LED to allow for translucent bio samples and low magnification and I was curious if this would be better to get than just the bottom LED? Thanks

Question: from laurieannema about the Zinc Dust experiment :

I did this experiment with Home Science Tools zinc powder. At first I did it over the alcohol burner on a stove top with the fan on high, but after at least seven minutes of no color change in either the zinc or the flame, I switched to the stove's burner. I tried that for several minutes, but without any visible change. Finally, I decided there must be something wrong with my Zinc and stopped. But after I let it cool and tried to throw it away, I discovered that the zinc powder had turned rock hard and fused to the spoon! It hadn't altered in appearance at all, no color change, no shrinking, nothing. I managed to scratch it a little with a tooth pick, but not enough to really get any out. This was the first time I used the spoon (from the C300 kit). Do you have any idea why this happened? And could you give me some tips on how to get it out of my spoon? Thanks.

Question: from apbaine about the Dimmers and Motor Speed Controllers experiment :

I'm working on the worksheet and I'm not sure what I should do with the pencil line. Do we have to hook up the wires to the paper? What is the correct way to do it? I am not getting a reading on my DMM. Ian (9)

Question: from kathmacgall about the Gyro Wheel experiment :


Question: from victoriahanline about the Special Science Teleclass: Rocketry & Spaceflight experiment :

Hello Mrs. Lipper I was wondering how the rocket lands with out a parachute. Can you explain, please?

Question: from weiland54 about the Introduction to Kinematics experiment :

I understand that you are currently working on making the Physics more user friendly but I was just wondering if you could give me a time frame for when to expect it. I'm excited but tired of checking every day.

Question: from Aurora Lipper about the Gyro Wheel experiment :

This is due to many factors. First, it's important to note that the camera "sees" things drastically differently from our eyes. Even the best camera will distort what is photographed, at least to some degree. The different cameras do have an impact on different looks of continents, colors, haze, etc. Also, these images are shot from vastly different angles, through windows with different refractive index and/or curvatures, with different film or different digital equipment. Some images we see are actually stitched together from many different shots. So yes, there are many explanations for sizes of continents appearing to change. The most likely reason would be that the shots are taken from different angles and distances from Earth. I hope this helps!

Question: from kathmacgall about the Gyro Wheel experiment :

Thank you for the information! I was also wondering why is it that in the pictures released by NASA over the years the size of the continents appear to change. is it because they use different cameras or is it something else?

Question: from Aurora Lipper about the Gyro Wheel experiment :

Hi there, Earth is an oblate sphere, so it's slightly squashed. However, to the naked eye it appears to be round in videos and photos. If you measured or used a compass, you'd discover anomalies that deviate from a perfect sphere. Regarding mechanical gyroscopes: they do need to maintain their orientation relative to their beginning orientation. To compensate for this, early gyroscopes required regular manual adjustments. I hope this helps!

Question: from Aurora Lipper about the Detonating Bubbles experiment :

You can check out our supply lists here: https://www.sciencelearningspace.com/category/shopping-list/unit-8-shop-list/ and here: https://www.sciencelearningspace.com/category/topics/shopping-list/unit-15-shop-list/ Many items will have shopping links, but please just let us know if you have difficulty locating anything specific.

Question: from wheresbo about the Detonating Bubbles experiment :

How do I get all the supplies in chemistry?

Question: from kathmacgall about the Gyro Wheel experiment :

Hi Aurora! You mentioned that the earth is a slightly squashed sphere, my question is why all the pictures from space show the earth as a perfect sphere? At least the ones i have seen from NASA so far. why is that? Also i have been wondering how do air planes artificial (gyroscopic) horizons compensate for the curvature of the earth? Especially if there gyroscopes are mechanical and not electronic? I look forward to hearing from you!

Question: from Aurora Lipper about the Zinc Dust experiment :

It sounds like it didn't get hot enough. My recommendation would be to try again if you’re able for a longer amount of time.

Question: from jennifer_albertson about the Introduction to Kinematics experiment :

Three questions from the Student Worksheet for 1-D Kinematics #7- In the equation t= 5s x 1m/60s x 1hr/60m, t= 0.0022 but when we calculate this we are getting 0.00138 so why is this not rounded to 0.0014? #13 - We are confused why in the given that acceleration is -9.81m/s² but when it is used to find the final velocity it is no longer a -9.81, but is a +9.81. We have the same question in problem #10 as well, where the a= -32.2 in the given but is +32.2 in the final velocity. #14 In the third part of this problem when solving for distance the equation is d= Vi + 1/2at² however in the next equation when numbers are plugged in it says d= 34+1/2(2.5)(15.5) where is the square on the 15.5? It seems like it should be d= 34+1/2(2.5)(15.5)². Can you help us understand these problems please? Thank you

Question: from karenketzner about the Zinc Dust experiment :

We burned the zinc powder (not zinc oxide) over the flame for about 4 minutes and did not get any color change from yellow and back to white. How long do we need to burn it? We bought the zinc from Home Science tools approximately a month ago and used an alcohol burner. Did our flame not get hot enough? Thanks!

Question: from jma5447 about the Fire-Water Balloon experiment :

wow thats really cool

Question: from Aurora Lipper about the Conductivity Testers experiment :

Interesting samples! Did you notice a difference in the frozen versus thawed mango?

Question: from studiojmm about the Conductivity Testers experiment :

We also tested the human body and it does conduct (3 AA batteries) but the light is not as bright as many of the other things we tested. We also compared various foods, including frozen vs. thawed mango, an apple, cheese, etc. and dry salt vs salt with some water.

Question: from Aurora Lipper about the Predator-Prey: Who Eats Whom? experiment :

Great tip! I'm glad you were able to troubleshoot it. Thanks for sharing :)

Question: from Aurora Lipper about the Nomenclature and formulas of binary compounds experiment :

Yes, a perchlorate ion is the least reactive oxidizer of the all chlorates.

Question: from eva_dellinge about the Predator-Prey: Who Eats Whom? experiment :

Regarding our problem with dripping: we tried dental wax around the opening, and that did the trick!

Question: from eva_dellinge about the Predator-Prey: Who Eats Whom? experiment :

We're having trouble keeping our small water canister from leaking. Instead of feeding along the string, it drips out the bottom. Any advice?

Question: from themorozovs about the Nomenclature and formulas of binary compounds experiment :

Hello, Ms. Lipper, Do we use the "hypo", "ite", "ate", and "per" prefixes and suffixes relative to the amount of oxygen in the compounds we're comparing, or will ClO4 always be perchlorate? -Anna Marie