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2020
2251

Pegasus Mail, 30 Years On

Sometime in the last two weeks of 1989, I sent myself an e-mail message: I no longer have it, unfortunately — it was lost in one of many system switches or crashes that happened in those early days... But it was the first message sent by a small MS-DOS application I had written, which at the time was called "ComNet…

2266

How strong is your knot?

MIT mathematicians and engineers have developed a mathematical model that predicts how stable a knot is, based on several key properties, including the number of crossings involved, and the direction in which the rope segments twist as the knot is pulled tight.