Catching up on another science video blogger - this week, Michael aka "Vsauce" posted this video, in which he discusses why two people's perceptions of the color red are quite unique, and why it's impossible to describe what pain feels like to an alien.
Also, sign-language apes who don't ask questions! Just watch and learn and be curious:
After watching these videos, sometimes I need to just sit in a dark room and go "Whoa." I wonder if this is what Keanu Reeves felt when he learned about the Matrix.
Keith Shaw rounds up the best in geek video in his ITworld.tv blog. Follow Keith on Twitter at @shawkeith. For the latest IT news, analysis and how-tos, follow ITworld on Twitter, Facebook, and Google+.
Watch some more cool videos: