5 Simple At-Home Science Experiments with Mark Rober

Does anyone know how to get food coloring off of your hands? Asking for a friend... Get your very own CrunchLabs Build Box! Get 2 FREE boxes at https://crunchlabs.com/5AtHomeExperiments


I started a company called CrunchLabs where we build a toy together and then I teach you all the juicy physics of how it works. So if you want to learn to think like an engineer and have a really fun time doing it, check out the current promotion where you get 2 FREE boxes at https://crunchlabs.com/5AtHomeExperiments



Science Bob’s top secret at home elephant toothpaste recipe:

A clean 16 ounce (473 ml) plastic soda bottle or a water bottle.

6 Ounces of 20-volume hydrogen peroxide liquid (20-volume is a 6% solution that is stronger than what you find in most pharmacies. It is typically used for lightening hair and is found at many beauty supply stores. You can use the 3% hydrogen peroxide found in pharmacies, but the reaction will be a bit smaller)

1 Tablespoon (15ml – one packet) of dry yeast

3+ Tablespoons (15 ml) of warm water

Liquid dishwashing soap

Food coloring



Science Teacher Version:

BIG Elephant Toothpaste Reaction

CAUTION: This reaction uses dangerous chemicals thatch cause chemical burns or even blindness. This demonstration should only be done by by trained professionals.

In a 5L flask:
250 ml 30% (not 30 volume) hydrogen peroxide
30ml liquid dish soap
30ml food coloring.

Add
75ml sodium iodide solution (2M)

The foam may have unreacted peroxide which could cause a chemical burn and so it should not be touched.



Thanks to these folks for providing some of the music in the video:

Ponder - @Pondermusic
Laura Shigihara - @supershigi
Andrew Applepie - https://soundcloud.com/andrewapplepie
Blue Wednesday - https://soundcloud.com/bluewednesday

PLATINUM TICKET INSTANT WIN GAME
NO PURCHASE NECESSARY. Promotion starts on 06/1/2024 & ends on 05/31/25, subject to monthly entry deadlines. Open to legal residents of the 50 U.S. & D.C., 18+. 1 prize per month: each month is its own separate promotion. For the first 2-3 months, winner may be notified via phone call instead of winning game piece. If a monthly prize is unclaimed/forfeited, it will be awarded via 2nd chance drawing. See Official Rules at crunchlabs.com/sweepstakes for full details on eligibility requirements, how to enter, free method of entry, prize claim procedure, prize description and limitations. Void where prohibited.