The data, in the October 29 Science, suggests that the first reshuffling occurred between 240 and 320 million years ago, just after bird and mammalian ancestors separated, and the most recent was 30 to 50 million years ago, during primate evolution.
Most people assume trucks are to blame.
But after analyzing 5,500 fatal accidents from 1994 and 1995, Daniel F. Blower of the University of Michigan found that passenger-vehicle drivers are at fault in 70 percent of fatal crashes involving heavy trucks. They were also more at fault in fatal sideswipe and rear-end collisions. Transistor Twist Reporting in the October 29 Science, IBM researchers have created a flexible transistor composed of organic and inorganic materials. Yam Perfect-Pitch Men Mozart's gift of perfect, or absolute, pitch may not be so rare. The mysterious ability to identify a note without referring to another note has been thought to occur in fewer than one in 10,000 people.