Particles, such as electrons, have a property called spin which can be measured at any angle, but when measured always results in one of two answers—up or down.
It takes roughly 500 gallons of water to produce a quarter pound hamburger, and in the process, approximately six pounds of greenhouse gases are released into the atmosphere.
Wikipedia is an astonishing resource that provides an enormous amount of information to billions of users.
According to special relativity, if a twin leaves earth in a high-speed rocket, goes out into space, and then returns to earth, he will return younger than his twin who stays home.
Altruism was first explained as kin selection: "I would lay down my life for two brothers or eight cousins", as J.B.S. Haldane put it.
There are these people called "ethicists" or "moral philosophers". They make their livings by thinking about what is right and wrong and how to live a moral life. Does all this thinking get them anywhere?
Constructive social interaction depends upon recognizing those one is interacting with. Not surprisingly, then, we have a section of our cortex devoted to facial recognition. But we're not the only ones.
Scientists are able to control hierarchy in rhesus macaques. They do this by introducing monkeys into groups one at a time, and at least initially the monkeys that are introduced first have higher status.
Sea otters are the largest members of the weasel family. When people started hunting sea otters for their fur, their population fell from roughly 225,000 to about 1,500, until the International Fur Seal Treaty took effect in 1911. Since the international ban on otter hunting, the population has rebounded back to roughly 107,000.