Scotland lunar-calendar find sparks Stone Age rethink

Archeologists have discovered a lunar calendar in Aberdeenshire, Scotland, that is nearly ten thousand years old. Their findings show that the calendar makers (1) thought about time and (2) figured out a means to follow it ...

US zoo to breed rhino siblings

In a desperate bid to preserve a critically endangered species, a US zoo is taking the controversial step of trying to mate brother and sister captive Sumatran rhinoceroses.

Human stem cell-derived hepatocytes regenerate liver function

Researchers have generated functional hepatocytes from human stem cells, transplanted them into mice with acute liver injury, and shown the ability of these stem-cell derived human liver cells to function normally and increase ...

Oregon's sunnyside turnoff fire

NASA's Aqua satellite captured an image of smoke from northern Oregon's Sunnyside Turnoff Fire on July 25 as the satellite passed overhead in space.

The arithmetic of gun control

Aiming to quell heated national debate about gun control with factual answers, two UC Irvine mathematicians have designed parameters to measure how to best prevent both one-on-one killings and mass shootings in the United ...