Convergence articles

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Suppose that the propability of success in an experiment is 1/10. How many trials of the experiment are necessary to insure even odds on it happening at least once?
Page 10: Courant through D'Ambrosio
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.
Two cog-wheels, one having 26 cogs, and the other 20 cogs, run together. In how many revolutions of the larger wheel will the smaller gain in 12 revolutions?
One military horse cannot pull a load of 40 dan; neither can 2 ordinary horses, nor can three inferior horses.
Two travelers, starting at the same time from the same point, travel in opposite directions round a circular railway.
A teacher agreed to teach 9 months for $562.50 and his board. At the end of the term, on account of two months absence caused by sickness, he received only$409.50. What was his board worth per month?
Poster picturing five famous women, from Hypatia to Grace Hopper.
Why should we use historical problems in today's classroom? This article answers that question and serves as an introduction to the problems on this website.
A description of a Research Experience for Undergraduates conducted in 2007 at Hood College.