Mark Rober is a scientist and a saint. More specifically, he’s a mechanical engineer who worked for NASA for a while and then for Apple and now he just does, well, crazy shit like this. And we say he’s a saint because as cool as this Elephant Toothpaste Volcano is, the reason he did it was to cheer up a really sick kid who had done something incredibly heartwarming to cheer up another very sick kid. Kindness, science, and explosive chemical compounds–it’s an inspiring combination.