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Britain's most famous mathematician takes us to the edge of knowledge to show us what we cannot know. Is the universe infinite? Do we know what happened before

If you could send a letter back through time to your younger self, what would the letter say? In this moving collection, forty-one famous women write letters to

One of America's leading historians offers the first major history of the Cold War. Packed with new information drawn from previously unavailable sources, the b

Praise for the Webby Award-winning newsletter: "I eagerly read 'Now I Know' every day. It's always fresh, always a surprise, and always interesting!" --Jimmy Wa

An introduction to the ways in which scientists report their results after having collected data during their experiments.