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Julien Coyne invented a digital sundial. Sundials usually cast a line or triangle to indicate the hour. This one is designed so that when light passes through, it displays the shapes of numbers.

IN these days of accurate clocks and watches no one thinks of using a sun dial to tell the time of day. At best such an instrument can be right but four times a year, and in many places it can ...

The recent change to daylight saving time is a reminder to invest time wisely and, perhaps, find time to enjoy an educational ...