Curious Kids[1] is a series for children of all ages. If you have a question you’d like an expert to answer, send it to This email address is being protected from spambots. You need JavaScript enabled to view it.[2]. How do they build things like tunnels and bridges underwater? – Helen, age 10, Somerville, Massachusetts When I was a kid, I discovered a Calvin and Hobbes comic strip[3] that
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Earth is constantly bombarded by fragments of rock and ice, also known as meteoroids, from outer space. Most of the meteoroids are as tiny as grains of sand and small pebbles, and they completely burn up high in the atmosphere. You can see meteoroids larger than about a golf ball when they light up as meteors or shooting stars[1] on a...

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If you have used Google lately and been lucky – or unlucky – enough to encounter an answer to your query rather than a bunch of links, you have been subjected to something called AI Overviews[1]. This is a new core feature that Google has been rolling out, a move widely anticipated since the company’s experiments with its LaMDA[2]...

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Five hundred years ago, in a mountain-rimmed ocean fjord in southeast Alaska, Tlingit hunters armed with bone-tipped harpoons eased their canoes through chunks of floating ice, stalking seals near Sít Tlein (Hubbard) glacier. They must have glanced nervously up at the glacier’s looming, fractured face, aware that cascades of ice could thunder...

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