Each year we dedicate the final issue of Science News to reviewing the big stories in science, technology and medicine. And each year, I marvel at the many significant news events and research discoveries crammed into a year.
Most significant: The growing tyranny of heat. For the second year in a row, our planet experienced the hottest year on record, a fact that threatened lives worldwide. In some places, the heat sparked drought, which lowered city water supplies and fueled wildfires. In other places such as Europe, it brought intense rainfall and disastrous flooding. Higher ocean temperatures bulked up hurricanes, and cases
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