Facebook founder Mark Zuckerberg speaks in a video that is part of the company's prospectus for investors. By remaining a privately held company, Facebook has helped boost the popularity of secondary stock markets.
In filing for its imminent initial public offering, Facebook included this sample of a stock certificate. The company's stock has been sought by investors on private markets.
Very soon, Facebook will go public. That means anyone will be able to buy shares of the social networking giant on the Nasdaq exchange. But sophisticated investors have already been buying pieces of Facebook and many other hot tech stocks, on private exchanges.
And now it seems that trading in private company shares is poised to grow, thanks to recent changes in the law.
Endurance athletes sometimes say they're "addicted" to exercise. In fact, scientists have shown that rhythmic, continuous exercise — aerobic exercise — can in fact produce narcoticlike chemicals in the body.
Now researchers suggest that those chemicals may have helped turn humans, as well as other animals, into long-distance runners.
The man behind the research is University of Arizona anthropologist David Raichlen, a runner himself. He does about 25 miles a week.
When it comes to walking, the easy part is understanding the benefits: Regular, brisk walks can strengthen our bones, help control blood sugar, help lower blood pressure and cholesterol, and the list goes on. The hard part is finding the time to fit it in.
Engineering physical activity back into Americans' daily lives is the goal of an educational campaign launched by Kaiser Permanente,an Oakland, Calif.-based health plan.
Somewhere on the path to the White House this year, a powerful set of ideas began to creep into the mainstream debate over which direction the country will take.
These are ideas that not too long ago were written off as marginal, or even worse, a little kooky. They come from Libertarians: free and open markets and extremely limited government. Those ideals are now becoming more mainstream and are influencing the Republican Party.