Just today I attended an absolutely mind boggling talk by Arvind Gupta. You may see for example this video. This video is from TED talks so he could not demonstrate all the wonderful things he has in his pocket but I would encourage you guys to watch other videos of him that are available on youtube and other places.
Finally, I would urge all of you to visit his website and also helping him to translate videos available there in your own language. Please reshare this note so that it reaches more and more Brilliant folks. :)