Jessi and Squeaks found a ton of rocks for their rock collection... but they're too heavy to get back to the fort! Join them as they figure out the perfect simple machine to help them out: the wheel and axle! ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/SciShow Or help support us by becoming our patron on Patreon: https://www.patreon.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow SOURCES: http://easyscienceforkids.com/kids-the-wheel-and-axle/ https://dbsenk.wordpress.com/2014/02/05/simple-machines/ http://electron6.phys.utk.edu/101/CH2/wheels.htm http://jiwismachines.com/lessons/ep3/Wheel%20and%20Axle%20-%20Jiwi's%20Machines%20Ep%203.pdf http://jiwi