The original TRS-80 came with 4K of RAM and a mass storage system that was, essentially, a RadioShack cassette player. The monitor was an RCA black-and-white television set with minor modifications.  More…

The Galton Board

The Galton board, also known as a quincunx or bean machine, is a device for statistical experiments named after English scientist Sir Francis Galton. It consists of an upright board with evenly spaced nails (or […]

Mersenne Primes

Many fundamental questions about Mersenne primes remain unresolved. It is not even known whether the set of Mersenne primes is finite or infinite. The Lenstra–Pomerance–Wagstaff conjecture asserts that there are infinitely many Mersenne primes and […]

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