How does your foot know it should be a foot? How come you don't grow ears on your arm? Find out in "Regulatin' Genes". ↓ More info and resources below ↓ Thanks to Jake Wachtel for directing/editing and Bob Siegel for the cameo. Special thanks to DERRICK DAVIS, world-renowned econ/public-policy major, for showing some love to hum bio. Subscribe to Science With Tom: http://bit.ly/1Hf68JW Website: https://www.sciencewithtom.com/ Facebook - https://www.facebook.com/ScienceWithTom Twitter - https://twitter.com/ScienceWithTom Instagram - https://instagram.com/sciencewithtom/ Snapchat - +ScienceWithTom