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Convergence articles

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Given the cats eye as shown. Let the radius of the eye be given by R. What is the area of the pupil?
A father left $20,000 to be divided among his four sons ages 6, 8, 10, and 12 years respectively so that each share placed at 4 1/2 compounded interest should amount to the same value when its possessor becomes the age 21.
A farmer sold a team of horses for $440, but did not receive his pay for them until 1 yr, 8 mo after the sale. He had at the same time another offer of $410 for them. Did he gain or lose by the sale and by how much, money being worth 6%/yr?
The story of Nicolaus Mercator, music, and logarithms.
A song for Pi Day.

Review of Bertram's text on the history of Greek science.

A translation of one of the earliest European mathematical texts to use the Hindu-Arabic number system.
Essays on how number has been critical to the work of scientists through the ages.
Two pages from a 1650 manuscript of the Lilavati of Bhaskara II (1114-1185). The second photo is an illustration of the Pythagorean Theorem.
A brief history of mathematics aimed at college students with little technical knowledge of mathematics.