Retroviruses, a broad class of viruses that infect people and different vertebrates, have a lot better range than beforehand thought, in accordance with new analysis.

Scientists have quantified the temperature of Earth's oceans over half a billion years in the past by combining fossil knowledge and local weather fashions.

Scientists at the University of California in Los Angeles and the University of Wisconsin in Madison have discovered the oldest currently known fossils, whose age is 3.5 billion years old. The article is published in the journal Proceedings of the National Academy of Sciences.