Early metal coinage came into use about the time of the Axial Age in the Greek world, in northern India, and in … See more

Most coins presently are made of a base metal, and their value comes from their status as fiat money. This means that the value of the coin is established by law, and thus is determined by the free market only in as much a… See more

The side of a coin carrying an image of a monarch, other authority (see List of people on coins), or a national emblem is called the obverse (colloquially, heads); the other side, carrying various types of information, is called the … See more

To flip a coin to see whether it lands heads or tails is to use it as a two-sided die in what is known in mathematics as a Bernoulli trial: if the probability of heads (in the parlance of Bernoulli trials, a "success") is exactly 0.5, the coin is f… See more

In the Philippines, small, engraved gold coins called Piloncitos have been excavated, some as lightweight as 0.09 to 2.65 grams. Piloncitos have been unearthed from Mandaluyong, Bataan, the banks of the Pasig River… See more

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