1859 introductions

conjecture in mathematics linked to the repartition of prime numbers

rechargeable battery type often used in cars

absolute temperature scale using Fahrenheit degrees

stove with an integrated electrical heating device to cook and bake

moral philosophy principle

Polkagris (plural: polkagrisar) is a Swedish stick candy that was invented in 1859 by Amalia Eriksson in the town of Gränna, Sweden. It remains a well-known albeit old-fashioned candy in Sweden, often sold at fairs, Christmas markets, and the like. It is still closely associated with Gränna. The traditional polkagris candy stick is white and red, and is peppermint-flavoured.

American one-cent coin (1859-1909)