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Convergence articles

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Show that the curves x2 - y2 = a2 and 2 xy = b2 cross at right angles.
Howard Eves' sixth edition is still worth considering for a textbook.
One military horse cannot pull a load of 40 dan; neither can 2 ordinary horses, nor can three inferior horses.
A lion, a wolf and a fox each take a certain amount of time to eat a goat separately. How long would it take all these animals together to eat the goat?
If a ladder, placed 8 ft. from the base of a building 40 ft. high, just reached the top, how far must it be placed from the base of the building that it may reach a point 10 ft. from the top?
A carpenter has undertaken to build a house in 20 days. He takes on another man and says; "If we build the house together, we can accomplish the work in 8 days!" How long would it take this other man to build the house working alone?

We invite you to send us information about these photographs of 20th century mathematicians.

On Triangles, by Regiomontanus (Johannes M�ller) (1436-1476), written in 1464 but not published until 1533.
The beginnings of land measurement in the early United States and how this affected American democracy.
Three persons bought a sugar loaf in the form of a perfect cone 25"" high and agreed to divide it...what was the slant height of each one's share?