If you ask people why they tip, they'll say it's obvious. They tip for good service, of course. It's a reward for a job well done.
But a leading theory on tipping suggests that's not really why we do it.
Studies show that the size of the tip doesn't have much to do with the quality of service. The weather, how sunny it is, what kind of mood people are in, these factors matter just as much as how satisfied the customers are with the service they receive.
Kindergartners at KIPP Empowerment Academy in South Los Angeles work on laptops while in another corner of the room, a group of students do an activity with a teacher.
Credit Larry Abramson / NPR
Part 1 of a two-part report.
Many school districts are reluctantly cutting staff and dropping courses in a desperate effort to respond to tighter budgets. But some educators are looking at ways to save money and improve instruction at the same time.
The answer for some schools: blended learning, which is part computer lesson, part classroom instruction.
Underwhelmed by Tuesday's formal announcement of candidacy by Utah Gov. Jon Huntsman Jr., some may ask why he's running for president.
Those asking might include people who had not heard of Huntsman heretofore, or who read a glowing magazine profile of him and expected more from his Statue of Liberty speech on Tuesday. Note to future candidates: If you kick off your campaign from a spot famously used by Ronald Reagan, be prepared to be compared – and not favorably.
New York plastic surgeon Brad Jacobs holds a silicone gel breast implant in 2006. That year the FDA allowed silicone implants back on the market, after a 14- year hiatus.
Credit Spencer Platt / Getty Images
Today the Food and Drug Administration said that silicone breast implants are generally safe, when used as intended. And the devices don't seem to cause autoimmune disease, breast cancer, or reproductive problems, as some previous reports had suggested.
But the agency also said that women frequently have problems with the implants, so much so that they often have to have surgery to remove or replace them.