The pulsar test subjects spin very fast - around 44 times a second - and are 30% more massive than thesunbut are only 15 miles (around 24 kilometers) in diameter, making them incredibly dense. This means that their gravitational pull is immense, for example, on the surface of a neutron...
Using just nine digits of pi, scientists can calculate the Earth’s circumference so accurately it errs by only about a quarter of an inch (0.6 centimeters) for every 25,000 miles (about 40,000 kilometers). It's not just math, though Every year the San Francisco museum that coined the...