How CRISPR-Cas9 edits DNA at a chosen location

CRISPR edits DNA at one chosen spot

CRISPR-Cas9 cuts DNA at a chosen location. The cell then repairs the cut, and scientists can use that repair process to remove, insert, or change genetic material at that spot.

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 CRISPR-Cas9 edits DNA at a chosen location

CRISPR edits DNA at one chosen spot

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