When was the first leap year?
The first leap year was 46 B.C.
It was then that the Julian calendar of 365.25 days was adopted.
The calendar required that an extra day be added every fourth year.
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The explosion of a star is called a supernova and is estimated to release 10^49 ergs or 1 followed by 49 zeros. By comparison, pronouncing an average syllable releases 200 ergs, and the first atom bomb produced 1021 ergs.
How far can a U.S. Army Pershing missile travel?
The 34.5-foot, 10,000-pound surface-to-surface Pershing missile has a range of approximately 400 miles.
How many hairs are on a human head?
About 100,000 hairs are on a human head. Human hairs grow about 0.01 inch every day.
Which age group in the United States has the highest voter turnout?
According to 1980 census findings, citizens in the 55 64 age group had a turnout of 71.3 percent. Close behind were those in the 65-to-74 age group, with 69.3 percent. Those 18 and 19 brought up the rear with a 34.2 percent showing.
How much of America drinks fluoridated water?
As of 1990, 53 percent of Americans drink fluoridated water. Of these, 121 million drink artificially fluoridated water; 9 million drink water from naturally fluoridated sources.
What does E = mc2 stand for?
According to Albert Einstein’s law on the equivalence of mass and energy, the energy (E) of a quantity of matter is equal to the product of the quantity’s mass (m) and the square of the velocity of light (c).