Human penis tension of the suspensory ligament that holds it in position. The following table shows how common various erection angles are for a standing male, out of a sample of 1,564 males aged 20 through 69. In the table, zero degrees is pointing straight up against the abdomen, 90 degrees is horizontal and pointing straight forward, while 180 degrees would be pointing straight down to the feet. An upward pointing angle is most common. Ejaculation is the ejecting of semen from the penis, and is usually accompanied by orgasm. A series of muscular contractions delivers semen, containing male gametes known as
How Not to Be Wrong How Not to Be Wrong How Not to Be Wrong: The Power of Mathematical Thinking, written by Jordan Ellenberg, is a "New York Times Best Selling" book that connects various economic and societal philosophies with basic mathematics and statistical principles. "How Not to Be Wrong" explains the mathematics behind some of simplest day-to-day thinking. It then goes into more complex decisions people make. For example, Ellenberg explains many misconceptions about lotteries and whether or not they can be mathematically beaten. Ellenberg uses mathematics to examine real-world issues ranging from the fetishizing of straight lines in the reporting of obesity to