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4 articles from PhysOrg

Taking a step back: US colleges returning to online classes

With COVID-19 cases surging just as students are about to return from winter break, dozens of U.S. colleges are moving classes online again for at least the first week or so of the semester—and some warn it could stretch longer if the wave of infection doesn't subside soon.

How a handful of prehistoric geniuses launched humanity's technological revolution

For the first few million years of human evolution, technologies changed slowly. Some three million years ago, our ancestors were making chipped stone flakes and crude choppers. Two million years ago, hand-axes. A million years ago, primitive humans sometimes used fire, but with difficulty. Then, 500,000 years ago, technological change accelerated, as spearpoints, firemaking, axes, beads and bows...

Colorado wildfire took hold 'in blink of an eye': governor

A fast-spreading wildfire that tore through several Colorado towns—laying waste to entire neighborhoods "in the blink of an eye," according to the governor—had largely burned itself out Friday, with heavy snow expected to douse any remaining embers.