Pre-contact Central and South American dogs (Canis familiaris) — all dogs preceding contact with European settlers — descended from a single maternal lineage that diverged after dogs entered North ...

“Proton emission is a rare form of radioactive decay, in which the nucleus emits a proton to take a step towards stability,” said Henna Kokkonen, a doctoral researcher at the University of Jyväskylä. ...

For decades, scientists have known that at least half of the Universe’s ordinary, or baryonic matter — composed primarily of protons — was unaccounted for. Previously, astronomers have used techniques ...

“Believe it or not, no one has really addressed whether it’s feasible to terraform Mars since 1991,” Dr. Lanza said. “Yet since then, we’ve made great strides in Mars science, geoengineering, launch ...