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How to Debug Chez Scheme Programs (2002)

How to Debug Chez Scheme Programs R. Kent Dybvig August 2002 When a program fails to operate as it should, it is said to have a bug. A bug is the root cause of an observed behavior, such as failure to terminate, failure to perform some action, termination with an error message, or merely producing incorrect results. The process of debugging a program is one of finding all of the bugs and "exterminating" them. This process first requires feeding the program a representative set of test cases,

The First Lunar Road Trip

Today in 1971, David Scott and James Irwin went for a drive—but this was no joyride. Scott and Irwin, NASA astronauts on the Apollo 15 moon mission, became the first people to burn rubber on the moon’s surface. The battery-powered Lunar Roving Vehicle, or “moon buggy,” could travel up to a cool 12 miles per hour, and took astronauts on longer journeys than previously possible during brief, cumbrous walks in their bulky suits. The buggy weighed a mere 77 pounds on the moon and could whisk around