The mysterious nature of time

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Researchers discover first sensor of Earth's magnetic field in an animal

The researchers discovered that hungry worms in gelatin-filled tubes tend to move down, a strategy they might use when searching for food.
When the researchers brought worms into the lab from other parts of the world, the worms didn't all move down. Depending on where they were from—Hawaii, England or Australia, for example—they moved at a precise angle to the magnetic field that would have corresponded to down if they had been back home. For instance, Australian worms moved upward in tubes. The magnetic field's orientation varies from spot to spot on Earth, and each worm's magnetic field sensor system is finely tuned to its local environment, allowing it to tell up from down.

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