Scientists have uncovered evidence of what is believed to be the earliest form of writing ever found in the New World. The discovery was based on glyphs carved on a cylindrical seal used to make imprints, and on greenstone plaque fragments found near La Venta in Tabasco, Mexico in the Gulf Coast region. The writings were produced during the Olmec era, a pre-Mayan civilization, and are estimated to date from 650 B.C.
Two of the three largest impact craters on Earth have nearly the same size and structure, researchers say, but one was caused by a comet while the other was caused by an asteroid. These results could have implications for where scientists might look for evidence of primitive life on Mars.