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Animals

Hibernating bears don’t get blood clots. Now scientists know why

People who sit still for hours have an increased risk of blood clots, but hibernating bears and people with long-term immobility don’t. A key clotting protein appears to be the reason why.

Health & Medicine

Estrogen in birth control could be cut way back, a study suggests

Delivering an extra low dose of estrogen, or a combination of estrogen and progesterone, at a specific time of the menstrual cycle may prevent ovulation.

Climate

‘Flash droughts’ are growing increasingly common

Droughts are forming faster more often in much of the world due to climate change, a new study finds.