If the question is about a single stamp, then Sweden's 1855 Three Skilling Banco printed in Yellow (Error of Color) is the rarest and most expensive stamp ever sold to date. Normally printed in green, only one instance of a yellow variety of this stamp was ever found. It turned up in 1885 some 30 years after it was issued. It was printed with the ink meant for the 8 skilling banco of the same set. It seems likely that a 3 skilling die was used to replace a broken 8 skilling die and when the error was caught by the pressman, one or more of the sheets failed to be destroyed. But even if more than 1 copy were ever released, no second copy has ever been found. From this period some 95 percent of all stamps issued were never saved, therefore it is conceivable that there may have been more copies released which were used and then trashed by the recipiant. In 1996 the one and only known copy of the stamp sold at auction for $2.27 million USD.
However, the most expensive single stamp collector's item ever sold is actually a cover with two different rare stamps tied together onto the one cover. In 1847 the British colony of Mauritius printed only 500 examples each of its first two stamps with respective face values of 1d and 2d. In total fewer than 30 of these very rare stamps survive today. In 1993 one cover with both the 1d and the 2d stamps attached side by side and tied together with a single cancelation mark sold for $3.8 million USD, the highest price ever paid for a stamp collecting item
Switzerland
Switzerland
The most valuable watch ever sold at auction is a Patek Phillipe "World Time" in platinum made in 1939. It sold for approx $4.03 million in 2002. The most valuable watch never sold at auction (because it is "lost") is the Omega Speedmaster Buzz Aldrin wore on the moon. Since Neil Armstrong did not wear his watch on the moon, this is the first watch worn on the moon. How much is this watch worth? untold millions to either Omega to display in Bienne or to the US government to display at the Smithsonian
about one-quarter of the worlds freshwater
the old worlds because they used to use it to preserve meats, in some countries salt was as valuable as gold
In 2008 at a auction a Ferrari 250 GTO sold for 23.5 million
The 1933 Double Eagle is the most valuable coin in the world. This coin was minted in 1933 but never issued because President Franklin D. Roosevelt took the country off the gold standard. A single example escaped destruction when it made its way into the collection of King Farouk of Egypt, was withdrawn from an auction of his possessions in 1954, and went underground for 40 years until it was seized from an English coin dealer in 1996. It was sold by the United States Government in an auction at Sotheby's New York on July 30, 2002, where it brought the record sum of $7,590,020. Another of one of the world's most valuable coins is the 1911 Canada silver dollar, it was a failed attempt to produce the first 1 dollar coin for Canada. only 3 were minted and 1 was made out of lead. this coin was one in the guiness book of world records for being the most valuable coin. a few years ago one sold at auction for $1,000,000
switzerland
Global Warming
Iceland
In free to play worlds they only drop bones, However, in members worlds, they also always drop the valuable unicorn horn, and uncommonly drop lockpicks.
LHC - Large Hadron Collider (Hadron is a type of particle of which the protons and neutrons that make up atomic nuclei are examples.)