For 29 years, fifth-grade teacher Michael Wilkinson has used space exploration to teach his students about math, science and the power of imagination. He shares his memories of the Challenger space shuttle disaster and why he never gave up on…

Jan 20

The calculations are in, and 2015 was the warmest year on record, ever since data collection on the planet’s surface land and ocean temperatures began in 1880, NASA and the National Oceanic and Atmospheric Administration announced Wednesday.

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