Sloth size and habitat shifted multiple times over the past 35 million years, but human hunting likely drove the slower, larger species to extinction.

Understanding historical bacteria evolution could lead to better infection control in the future.

Although there is no exact comparison to any known bacterium on Earth, the space bacteria shares some key genetic similarities with a terrestrial cousin.

Observations show a stronger galaxy piercing a weaker one with a lance of radiation, reducing its star-making ability.

Learn why both human teeth and an ancient fish contain a key sensory substance — but in different locations.

As the Hubble Space Telescope celebrates 35 years in space, here's what to know about the ambitious instrument.

Find out where to catch the Milky Way's appearance in the night sky as it becomes more visible with the 2025 summer approaching.

These tiny, weak signals of light may be useful to monitor the health of plants and animals.

Learn how Homo erectus journeyed to the Indonesian island of Java, leaving behind fossils that now provide insight on the species' life before extinction.

Learn how researchers combined modern tech, text, and bones to uncover details about a disabled man’s life in medieval Sweden.

The solar flares are bursts of magnetic energy and can impact power, communication, and navigation systems on Earth.

Deep dive into the amber deposits on Hokkaido Island in Japan, which may serve as a record of ancient tsunamis.

Learn about the strongest solar storm to ever strike Earth, occurring around 14,300 years ago during the last Ice Age.

New research uncovers how two ancient hominids used their hands in unique ways for climbing, tool use, and movement.

Learn about SYNT-101, the emerging treatment for obesity that combines the best of two proven methods.

Learn more about the lineages of Australian and South American tree frogs, which separated approximately 55 million years ago at the latest, according to a new analysis of fossils.

Fossil suggests four-legged tetrapods transitioned from ocean to land 35 million years earlier than previously thought.

Learn about a new study that uses the data from Magellan to reveal insights into Venus’ ongoing tectonic activity and how it looks a lot like early Earth.

Scans of the Chicago Archaeopteryx show feather and bone features that worked together to create lift.

Learn about the controversial Gaia hypothesis, stating that Earth is its own living system kept in balance by organisms.

By examining different materials buried along with the watercraft, experts could determine the age of the boat.

Learn what secrets this pregnant ichthyosaur reveals from the Early Cretaceous and why this find is so important.

Discover how an analysis of more than 700 objects reveals obsidian came into the Aztec capital from far and wide.

Learn how a trio of scientists do the math, based on a Stephen Hawking theory, and even ask how long it would take for a human and the moon to evaporate.

A famous cache of wooden spear shafts and other hunting tools was once ascribed to a group of early humans that were not known for social organization.

Discover why scientists and politicians are calling for the creation of a Coordinated Lunar Time.