Elon Musk, the world’s richest man who is now leading a sweeping effort to reshape the federal government, offered the most sustained defense of his far-reaching moves during a question-and-answer ...

When hundreds of eerily perfect circles were discovered on the bottom of the Mediterranean Sea, theories abounded about what they could mean. Four years of underwater research revealed a lost world.

Euclid, the European Space Agency’s dark Universe detective, has made an astonishing discovery – right in our cosmic backyard ...

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