How the Moon is slowly making Earth's day longer

The Moon is slowly making Earth’s days longer

The Moon’s pull slowly makes Earth spin more slowly, while the Moon moves about 38 millimeters farther away each year. Over millions of years, this has made Earth’s days much longer.

Lake Superior could spread a shallow layer of water across both Americas

~30 cm deep

Lake Superior contains roughly 12,000 cubic kilometers of freshwater. If that water were spread evenly over the land area of North and South America, it would form a layer roughly 30 centimeters deep. The comparison makes the scale of the lake easier to imagine: one body of water holds an astonishing volume.

Stone tools may predate the genus Homo

At Lomekwi 3 in Kenya, stone tools date to 3.3 million years ago—earlier than known evidence for toolmaking around 2.5 million years ago. The toolmakers may have belonged to a species that lived before the genus Homo, a group of human species.

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How the Moon is slowly making Earth's day longer

The Moon is slowly making Earth’s days longer

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