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For ecologists, the Covid-19 pandemic has presented a remarkable natural experiment in what can happen to wild animals when humans stay home.

Medetomidine, a veterinary sedative mixed into fentanyl, has sent thousands to hospitals, not only for overdose but for life-threatening withdrawal. It is spreading to other cities.

The sexually transmitted disease has become increasingly resistant to existing antibiotics.

The moon will be about one-third full as one of the year's last meteor showers becomes most visible.

Perhaps it was hiding from predators. Or trying to catch food. Then again, maybe it just wanted to be left alone.

Researchers found a chasm between the health reasons for which the public seeks out cannabis and what gold-standard science actually shows about its effectiveness.

A federal lawsuit argues that proposed work by ConocoPhillips could threaten delicate ecosystems in the largest tract of public land in the U.S.

The group's report had been expected to provide a road map for change after months of upheaval at the agency.

Escalating activity along a fault line in the Sea of Marmara is moving closer to Istanbul, seismologists warn.

Ancient plants called cycads say "come hither" in infrared.