What you are looking at is a gathering of 100.000 Theravada Buddhist monks who are ‘praying’ for a better world. The reason why I am adding the apostrophe is because they are not literally praying, there is no deity to whom they address. This happened at a temple in Bangkok.
Andrei's background is in geophysics, and he's been fascinated by it ever since he was a child. Feeling that there is a gap between scientists and the general audience, he started ZME Science -- and the results are what you see today.