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Having been given the lengths, a and b, of two straight lines drawn from the acute angles of a right triangle to the middle of the opposite sides, determine the length of those sides.
The highest point of the Andes is about 4 miles above sea level.
This is the title page of the Siderius Nuncius (Starry Messenger) of Galileo (1564-1642), published in 1610. This book was a report on Galileo's first investigations with a telescope. Also includes Galileo's initial sketches of the surface of the moon.
These posters illustrate aspects of the history of mathematics in countries from Babylonia to Ireland.
This is an invited working conference as part of the ICMI Study Series.
Suppose a man had put out one cent at compound interest in 1620, what would have been the amount in 1824, allowing it to double once in 12 years?

The copybooks of two young men reveal very different purposes in learning geometry.

A history of the development of Pascal's triangle in its various manifestations
The latest HPM Newsletter is now available here. Read it!
An analysis of James Gregory's proof of the Pappus-Guldin theorem, along with the original documents both in Latin and English.