German emissions at 70-year low as coal use drops

German emissions were at their lowest point in around 70 years as Europe's largest economy managed to reduce its dependence on coal faster than expected, a study published Thursday showed.

Communicating with a relativistic spacecraft gets pretty weird

Someday, in the not-too-distant future, humans may send robotic probes to explore nearby star systems. These robot explorers will likely take the form of lightsails and wafercraft (a la Breakthrough Starshot) that will rely ...

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