Convergence articles

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A sketch of the history of topology, beginning with the polyhedron formula, but continuing up to the present.
Having been given the sum of two numbers,a, and the difference of their squares,b, find the numbers.
A man bought a number of sheep for $225; 10 of them having died, he sold 4/5 of the remainder for the same cost and received$150 for them. How many did he buy?
Posters illustrating mathematics concepts in such places as China, Japan, India, and the Americas.
A circle is inscribed in an isosceles trapezoid. Find the relationship of the radius to the sides.
Two travelers, starting at the same time from the same point, travel in opposite directions round a circular railway.
The author became fascinated with the mysterious role of √-1 in electronics. Turning to history for insight, he brings the perspectives of both a practical man and a scholar in conveying the enchantment of mathematics for a non-mathematician.

A math history class visits the 'Beautiful Science' exhibit at the Huntington Library in Southern California.

In a square box that contains 1000 marbles, how many will it take to reach across the bottom of the box in a straight row?
Find the greatest value of y in the equation a4 x2= (x2 + y2)3.