Word: use
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Dates: during 2000-2009
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...safest drivers in the study had half the crash risk of students without parental surveillance in the year preceding the survey. The aggressively supervised teens were also 50% less likely to speed, 71% less likely to drive after drinking and 29% less likely to use their cell phones while on the road, compared with their friends who reported having more-permissive parents...
...Ginsburg and another group reanalyzed the same data set and found that teens who considered themselves to be the primary driver of a vehicle were twice as likely to get into accidents as those who shared responsibility for a car or had to report to their parents for each use. In the survey, 70% of kids reported that they were the main driver of a car, regardless of whether they owned the vehicle. This perception, says Ginsburg, can promote more irresponsible driving habits. "Kids who have easy access to the keys are probably less likely to have those protective conversations...
Most parents would probably say they talk to their teens about responsible driving, but Ginsburg notes specific techniques that the parents of the safest teen drivers tend to use. These include setting firm rules and boundaries for driving - such as no speeding, no talking on a cell phone or texting while on the road and no driving while intoxicated. Parents of safe drivers also tend to make it a point to explain to their children that the reason for their rules is to ensure the child's safety. ?They have to see the rules as a safety issue...
...roughly twice as heavy as Lucy. The structure of Ardi's upper pelvis, leg bones and feet indicates she walked upright on the ground, while still retaining the ability to climb. Her foot had an opposable big toe for grasping tree limbs but lacked the flexibility that apes use to grab and scale tree trunks and vines ("Gorilla and chimp feet are almost like hands," says Lovejoy), nor did it have the arch that allowed Australopithecus and Homo to walk without lurching side to side. Ardi had a dexterous hand, more maneuverable than a chimp's, that made her better...
...females and stay together in order to rear their offspring (though not necessarily monogamously or for life). The evidence of this harmonious existence comes from, of all things, Ardipithecus' teeth: its canine teeth are relatively stubby compared with the sharp, dagger-like upper fangs that male chimps and gorillas use to do battle. "The male canine tooth," says Lovejoy, "is no longer projecting or sharp. It's no longer weaponry...