From mudstones on Mars to strange gases in exoplanet atmospheres, tentative evidence for extraterrestrial life is starting to come thick and fast. But when we've found it, how will we know for sure?

Washington, D.C. art dealer Todd von Ammon writes in a column about the trouble posed by current gallery and fair business ...

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Nadella runs a weekly hour-long meeting with many of the same staff, where he often grills them about their work, resulting in directives such as consolidating how different teams handle post-training ...