Most geneticists agree that Native Americans are descended from Siberians who crossed into America 26,000 to 18,000 years ago via a land bridge over the Bering Strait. But while genetic analysis of modern Native Americans lends support to this idea, strong fossil evidence has been lacking.
Now a nearly complete skeleton of a prehistoric teenage girl, newly discovered in an underwater cave in the Yucatán Peninsula, establishes a clear link between the ancient and modern peoples, scientists say.
Physicists Nima Arkani-Hamed and Jaroslav Trnka recently published a significant advance in the study of Scattering Amplitudes. These are formulas that physicists use to calculate everything from the chance an unstable particle will decay to the probability of new discoveries at the Large Hadron Collider. The two reformulated scattering amplitudes within a popular framework called N=4 super Yang-Mills, treating them as properties of abstract geometrical objects. In doing so, Arkani-Hamed and Trnka hope to gain a deeper understanding of the nature of quantum field theory.