Evolution: A fish that evolved to stand up on land went back to living in water 

A fossil from 385 million years ago named Qikiqtania wakei shows that a descendant of early land animals lost its adaptations for land and became a more efficient swimmer

Source: Evolution: A fish that evolved to stand up on land went back to living in water | New Scientist

Megalodon sharks ruled the oceans millions of years ago – new analyses of giant fossilized teeth are helping scientists unravel the mystery of their extinction

Megalodon, the world’s largest known shark species, swam the oceans long before humans existed. Its teeth are all that’s left, and they tell a story of an apex predator that vanished.

Source: Megalodon sharks ruled the oceans millions of years ago – new analyses of giant fossilized teeth are helping scientists unravel the mystery of their extinction

Antarctic bacteria reveal an evolutionary limit to dealing with heat | New Scientist

Some bacteria living in the Southern Ocean can only adapt to temperatures about 2°C above what they usually live in, and other organisms could face similar limits adapting to higher temperatures

Source: Antarctic bacteria reveal an evolutionary limit to dealing with heat | New Scientist

To search for alien life, astronomers will look for clues in the atmospheres of distant planets – and the James Webb Space Telescope just proved it’s possible to do so

Life on Earth has dramatically changed the chemistry of the planet. Astronomers will measure light that bounces off distant planets to look for similar clues that they host life.

Source: To search for alien life, astronomers will look for clues in the atmospheres of distant planets – and the James Webb Space Telescope just proved it’s possible to do so