Does E always equal mc²? University of Arizona physicist Andrei Lebed suspects not - and plans to try and check.
Our ancestors were attaching spear points to wooden hafts as long ago as 500,000 years - a good 200,000 years earlier than thought.
Scientists from the University of Arizona have released a video of the leggiest animal on Earth, the millipede Illacme plenipes, which has 750 legs.
Complex brains evolved much earlier than previously believed, the discovery of a 520-million-year-old fossilized arthropod has shown.
US researchers have built what they say is the first set of robotic legs that walk just like a human being.
Pests are adapting to genetically modified plants designed to kill them, raising doubts over the future of biotech crops.
Electrical engineers from Duke University and the University of Arizona have created the first gigapixel camer, and say it could be available to consumers within five years.
Graphite could help engineers in their perpetual quest to design smaller and more power efficient electronic devices.
Nearly four million Americans are at risk of severe flooding by the end of the century as climate change raises sea levels around the country.
A group of academics has suggested a pragmatic, if radical, solution to the problem of continuing commercial whaling - putting a price on the animals.
Our ancient human ancestors interbred with other early hominids as well as Neanderthals, new research indicates.
Star Wars-style holographic video chat is now a big step closer, with the development of a system that can project 3D moving images without the need for special glasses.
Scientists have created organic macromolecules by zapping a Titan-like atmosphere with UV rays. The discovery supports the idea that the moon of Saturn could support life.
A seventh-grade class in Cottonwood, California, has discovered a Martian cave.