How octopuses drill through shells to kill prey

Some octopuses drill through shells

Some octopuses use tiny teeth near their mouths to drill into the shells of crabs and mollusks. Their toxic saliva then helps break down the shell, and the prey dies very quickly once the shell has been opened.

Earth’s magnetic field pushes away much of the solar wind

Moving material deep inside Earth creates its magnetic field. That field forms a protective region around the planet that pushes away much of the solar wind, although it also traps some charged particles.

Some bacterial defenses attack viral DNA only while it is being used

Some CRISPR systems can attack both viral RNA and viral DNA. In certain systems, however, the DNA can be attacked only while the virus is using it to make RNA. The defense therefore targets the virus's genetic material when it is active.

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How octopuses drill through shells to kill prey

Some octopuses drill through shells

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