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The eleventh International Congress on Mathematical Education will meet in Monterrey, Mexico from July 6 to July 13, 2008.
If you are h feet tall and walk all the way around the Earth, keeping to the same circumference, how much farther has your head gone than your feet when you complete the journey?
This book explores the history of mathematics from the perspective of the creative tension between common sense and the "impossible" as the author follows the discovery or invention of new concepts that have marked mathematical progress.

Netscape Users
Find the area of the elliptical segment cut off parallel to the shorter axis;
A cylindrical tin tomato can is to be made which shall have a given capacity. Find what should be the ratio of the height to the radius of the base that the smallest possible amount of tin shall be required.

Three images from Kepler's 1609 Astronomia Nova, the text in which he introduced his first two laws of planetary motion

Determine the dimensions of the least isosceles triangle ACD that can circumscribe a given circle.

Curve sketching, tangent lines, and optimization, explored via interactive applets

A set of four posters dealing with the Pythagorean Theorem, infinity, prime numbers, and the history of pi.