Pregnant turtles hit the pause button on their eggs' development until the time is just right to lay them in a nest, researchers say. The careful moms do this by producing a gooey substance in their reproductive tracts that cuts oxygen to the embryos, a study shows.
When NASA's Landsat Data Continuity Mission (LDCM) launches on Monday (Feb. 11), it will deliver to orbit the latest and most capable Earth-observing satellite in a four-decade long project to study the surface of our planet.
Three women with an extremely rare type of brain damage had never felt fear in their adult lives. Snakes and scary movies didn’t do it for them. In fact, they couldn’t even recognize a fearful expression on someone else’s face. But when given a hit of carbon dioxide that made them feel like they couldn’t breathe, the women experienced something surprising and novel: They were panicked.