Renne says he hopes this kind of validation, will quiet down skeptics who don't believe the Earth is very old. The validity of the basic principles is just not open to question. Renne's next step is to use the technique to accurately date events which have no recorded timeline. For Science Today, I'm Larissa Branin. This is Science Today.
Parents play a big part when it comes to their teenagers taking risks.
Yet psychiatrist Lynn Ponton of the University of California, San Francisco says for centuries, adolescents have been given a bad rap when it comes to risk taking. A lot of times, it's mischaracterized as adolescent rebellion. That they're angry with their Mom and Dad, they want to fight back, get back at them and do it differently. That's not actually true, that most of the time they say over and over again - Mom or Dad, it's about me, I want to do this to define myself. So that pull, that drive to develop their identity is what I call healthy risk taking.