On Friday 4th November, Dr Karl Kruszelnicki launched his 31st book, Brain Food, on Twitter!

He hosted an event where people asked questions on Twitter, and Dr Karl answered them on Ustream (live broadcast). The launch ran for an hour, and each question had to be answered in under a minute. Lots of free books were given away as well.

If you missed out on the broadcast, you can watch it on YouTube, or download the podcast via iTunes or RSS.