Here's a really nice video discussing numbers regarding wwii. It's visualizing things really well, no matter what you know about the real numbers.
I think it's a must to see:
https://vimeo.com/128373915It's a nice video, but the upbeat ending could have mentioned the killing potential of global thermonuclear war for example. Probably in the 100s of millions in first few hours, not mentioning leaving the planet an inhospitable place, potentially killing billions. Anyway, worth a watch.