Scientists at three German universities studied more than 20,000 people and found a correlation between height and backbone: The taller you are, the bolder you'll be.
Men are willing to take more risks than women, finds an analysis of 150 studies about risk taking published by the American Psychological Association.
The German study also discovered that risk taking decreases significantly with age.
"Aries, Leo, and Sagittarius are filled with passionate energy. They're the most assertive signs and are intent on making their mark on the world," says Joanna Martine Woolfolk, author of The Only Astrology Book You'll Ever Need.
A version of this article appeared in the November 2011 issue of Fast Company magazine.