I like to do these roundups every so often as an excuse for sitting around and watching videos for the better part of an afternoon. Enjoy!
Tan Le has developed a headset which reads your brainwaves and control virtual and physical electronics.
Kevin Stone wants to use other animals to grow new joints for humans.
Julian Assange explains why the world needs Wikileaks.
Carl Safina takes us to the Gulf of Mexico and into the oil spill.
Elif Shafa argues that fiction can overcome identity politics.
Nalia Nadkarni brings science classes and conservation programs to prisons.