Rapid melatonin test can help astronauts and others easily monitor their biological rhythm

Archaeologists working at the ancient settlement of Stăuceni-"Holm" in northeastern Romania have uncovered a mega-structure measuring 350 square meters dating back about 6,000 years. This is one of the few examples of a massive building that has been physically excavated in the region. It is hoped that it will reveal more about the Cucuteni-Trypillia culture (ca. 5000–3500 BC) of Eastern Europe, which is known for its large, well-planned settlements.

"You want to stick your finger in a dinosaur brain?" asked Simba Srivastava. Surrounded by cabinets full of ancient bones in the paleobiology lab, the Virginia Tech undergraduate student held out a lumpy, pockmarked fossil.

For the last five years, the Dark Energy Spectroscopic Instrument (DESI) has been systematically scanning the night sky. Today marks the completion of its first map, which is the largest high-resolution 3D map of the universe ever made.