Canal de bjfull8

Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane.

Like CrashCourse on Fac...

follow @tweetsauce

NEW extreme sports channels with special messages for Vsauce:

RIDEchannel (Tony Hawk): http://bit.ly/xxao37

AlliSports: http:/...

Why do some years have an extra leap day and what is it for?

Also check out MinutePhysics' video: http://www.youtube.com/watc... & SciS...