history of mathematics
Bill Casselman writes about the intriguing amateur mathematician Henry Perigal, who took his elegant proof of Pythagoras' Theorem literally to his grave  by having it carved on his tombstone.

More than a century after the death of its inventor, the world's first computer printer has finally been constructed at the Science Museum in London. 
Johannes Kepler (15711630) is now chiefly remembered as a mathematical astronomer who discovered three laws that describe the motion of the planets. J.V. Field continues our series on the origins of proof with an examination of Kepler's astronomy.

Daniel Bernoulli (17001782) discovered the relationship between the density of a fluid in a pipe, the speed it is travelling in the pipe and the pressure exerted by the fluid against the walls of the pipe. This is the story of what happened.

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