Don Pettit is my favourite astronaut. He's easily the nerdiest guy who ever made it up to the International Space Station. The reason he's so cool is that he c

Don Pettit is my favourite astronaut. He's easily the nerdiest guy who ever made it up to the International Space Station. The reason he's so cool is that he can present scientific topics in an easy-to-understand way that really captures the imagination. He conducts a whole bunch of personal experiments in orbit and then uploads them to Youtube. Using static electricity to spin water droplets around a knitting needle. Using surface tension to improve coffee usability. Real science, but presented with a wide-eyed innocence that shows how stoked he is to be up there doing all this cool stuff. A great asset for NASA in my opinion. They should fly him all the time!