Five questions about the historic comet landing

The European Space Agency has achieved a historic first—landing a washing machine-sized spacecraft on a comet speeding through our solar system at 41,000 mph (66,000 kph). Here are answers to five questions about the space ...

Colombian condor repopulation program gets technology upgrade

Their wings spanning 10 feet or more as they glide serenely above Colombia's Andes, condors are majestic physical specimens. They have been important symbols here since pre-colonial times, when indigenous tribes saw them ...

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