### How many Sudoku puzzles are there?

There are a total of 6,670,903,752,021,072,936,960 possible solutions, yet when mathematicians took away rotations, reflections, permutations and relabeling, which takes away the same puzzle in just a different form, the number of solutions was 5,472,730,538.

This results in an oval ring around each magnetic pole where auroras occur. The north pole aurora is called the aurora borealis and the aurora at the south pole is called the aurora australis. Depending on the level of recent solar activity, there may or may not be visible auroral activity all the way around the ring.

This engraving depicts Hernando de Soto’s discovery of the Mississippi River at a point below Natchez on May 8, 1541. De Soto (1500–1542) was the first European to document the river.

When the band originally formed, Ringo Starr, born July 7, 1940, was the oldest member. John Lennon, born October 9, 1940, was the second oldest. Paul McCartney, born June 18, 1942, the third and George Harrison, born February 25, 1943, the youngest.

New York City was the first capital of the United States once the Constitution was ratified. George Washington took the oath of office to become the first President of the United States from the balcony of the old City Hall.

The olive wreath also known as kotinos (Greek: κότινος), was the prize for the winner at the ancient Olympic Games. It was an olive branch, of the wild- olive tree that grew at Olympia, intertwined to form a circle or a horse-shoe.

In 1996, Elton was appointed a CBE (Commander of the British Empire). On 24 February 1998 he was knighted by Queen Elizabeth II, becoming Sir Elton John, in recognition of his contribution to music and fund-raising for AIDS charities.

Water’s composition (two parts hydrogen to one part oxygen) was discovered by the London scientist Henry Cavendish (1731-1810) in about 1781. He reported his findings in terms of phlogiston (later the gas he made was proven to be hydrogen) and dephlogisticated air (later this was proven to be oxygen).