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Great White Sharks Flee From Orca Attacks

The pair of Orcas deterring Great White Sharks

NASA's InSight lander is likely retiring later this year. But thanks to its marsquake-measuring seismometer, the lander has already revealed a great deal about the internal structure of the Red Planet. Here's the basics of what different seismic waves (p-, s-, Rayleigh, and Love waves) can teach us.