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...becoming an astronaut in 1987. She flew as a mission specialist on STS-47 in 1992 and STS-60 in 1994, and was the payload commander on STS-85 in 1997. In July 1999, she transferred to the Marshall Space Flight Center, where she became Director of Flight Projects. Dr. Mae C. Jemison, the first African-American woman in space, was born on October 17, 1956 in Decatur,...

...become filthier and filthier, until at last it threatens to produce still deadlier maladies than cesspools in every street would have done. In fact, in our reforming zeal, we have merely changed a hundred thousand small cesspools for one moster one. We undertook only a part of the necessary work, and that not the most important part. When the old Board of Health resolved...

...becomes so strong that not even light (perhaps the fastest thing in the universe) is fast enough to get out. This is a black hole. Beautiful curves Starlight and black holes are fun, but what does this have to do with day-to-day life on Earth? Have you ever used the Global Positioning System (GPS)? It’s a common feature of mobile phones today, but it relies entirely on...