Also on NPR, does teeth whitening using light actually work? Not better than at-home gels say some researchers:
Chemist Lee Hansen, a professor emeritus at Brigham Young University, explains there was an assumption that heat from the light served as a catalyst to decompose the bleaching gel.
"That's the theory behind it," says Hansen. But he found the lights don't generate enough heat or give off enough UV light to accelerate the chemical reaction.
As part of the study, a group of researchers at Clinical Research Associates, the Consumer Reports of dentistry, tried a combination of bleach and light on a small group of patients.
On one side of the patients' mouths, they applied bleaching gel alone. On the other side, they added the light. All the teeth became whiter, and there was no difference in the two sides.
Other researchers dispute these findings.
Shelley at Of Two Minds links to a study showing that botulinum toxin from Botox injections may get into your brain. Not good. I know a lot of Upper East Side women who are hurling towards a world of hurt.
Freakonomics Blog asks a quorum of interested parties how much psychology and psychiatry have progressed over the last century. Opinions differ.
Good Math, Bad Math looks at the controversy in the philosophy of statistics. Bayesians and frequentists, can't we all just get along?
The US military will now be using field lie detectors. They will be using them in spite of the very reasonable concern that they are ineffective and prone to error.
Read the whole thing.