ScienceToothless pterosaurs with 39-ft. wingspan, king of the skies 60 million years ago Toothless winged reptiles known as pterosaurs dominated the ancient skies 60 million years ago. Some of these creatures were so big they had to run before taking off.by Rhodi Lee
ScienceRats are the new astronauts: NASA to send rats to space to test microgravity effectby Jim Algar