naked mole-rat body temperature huddling burrows

Naked mole-rats manage heat by moving or huddling

Unlike most mammals, naked mole-rats let their body temperature rise and fall with the surroundings. They huddle when cold and move to cooler, deeper burrows when hot. At 29 °C or above, their temperature control shifts toward the steady pattern seen in many mammals.

~14 centuries

Caesar and Augustus became titles for rulers

The name Caesar and the title Augustus became titles used by Roman rulers for centuries. Caesar also gave rise to later ruler titles such as the German kaiser and Russian tsar.

Flying is safer per kilometer than bus or rail

About 10×

Measured per passenger-kilometer—the distance traveled by one passenger—air travel is about 10 times safer than bus or rail travel. Measured per journey, flying is significantly more dangerous than traveling by car, rail, or bus.

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naked mole-rat body temperature huddling burrows

Naked mole-rats manage heat by moving or huddling

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