Empathy seen in primates

Answers: In monkeys and apes, says primatologist Frans de Waal in "Primates and Philosophers: How Morality Evolved." For example, after one chimpanzee has attacked another, it is not uncommon for a bystander to go over and embrace the victim; now the screaming, yelping and other signs of distress stop. In fact, so strong is this tendency that Russian scientist Nadia Ladygina-Kohts, who raised a juvenile chimp, said that if her charge escaped to the roof, holding out food would not entice him down. "The only way was to sit and sob as if she were in pain, whereupon the young ape would rush down to put an arm around her, a wounded expression on his face."

Among groups in captivity, reciprocity, too, is evident. Studies show that when a chimp shares food with others, the sharer is more likely to be generous toward other chimps that have previously groomed them — an obvious keeping track of incoming and outgoing services.

Question: Flip a U.S. Lincoln penny onto a tabletop 100 times and what'll it be, more heads or more tails? Now try spinning the penny instead. Finally, have a (very patient) friend balance 100 pennies on their edge, then slam the tabletop and see how they fall. Wouldn't you think about 50-50 in all three?

Answer: For flips of a "fair" coin, yes, but the Dizzy Lincolns will more likely settle with tails up, the Lincolns on edge with heads up, say Edward Burger and Michael Starbird in "The Heart of Mathematics." These are surprising results, due possibly to the penny's edge being slightly beveled, permitting an easier release from the mold during casting. So you wagerers, it's "heads, you win" and "tails, you win again," provided you select the right game!

Question: From head to toe, how many different varieties of hair do you grow and at what rates?