Kosmos 482 launched for Venus in 1972 but never left Earth orbit. The spacecraft has now lost enough energy that it can’t fight gravity anymore.

The porpoise is critically endangered. Ancient Chinese poems reveal the animal’s range has dropped about 65 percent over the past 1,400 years.

Shape matters as well as size in the great range of male frog show-off equipment for competitive seductive serenades.

At 300 light-years away, the interstellar cloud is the closest of its kind ever found to Earth and the largest apparent single structure in the sky.

A tailor-made version of Minecraft let researchers look at the success of learning individually or taking cues from others while foraging for fruit.

Introducing captive-bred axolotls to restored and artificial wetlands may be a promising option for the popular pet amphibian.

A scientist who worked on the National Climate Assessment explains how stopping work on it may make us more vulnerable to extreme weather disasters.

In chess as in life, people use memory as a shortcut for decision-making. That strategy can backfire when the present doesn’t resemblance the past.

An initial clinical trial in Kenya found no safety concerns, a first step toward testing unithiol as a treatment for venomous snakebites in people.

An overlooked Antarctic water system could raise sea levels by more than 2 meters by 2300, computer simulations show.

A new antivenom relies on antibodies from the blood of Tim Friede, who immunized himself against snakebites by injecting increasing doses of venom into his body.

As calls to end fluoride in water get louder, changes to the dental health of children in Calgary, Canada, and Juneau, Alaska, may provide a cautionary tale.