We can estimate the age of an open cluster of stars by examining (The turnoff point of the cluster)
The answer is steamboats! The first steamboat came year 1807 and was invented by John Fitch:)
The site of the chernobyl nuclear accident in 1986, was at the Chernobyl Nuclear Power Plant, which was located in Ukraine. In terms of cost and casualties, it was the worst nuclear power plant disaster in history.
The following officials would be forming a part of democracy: a cabinet member, a president (such as the president of Israel), and a member of a parliament.
An official that is not part of a democracy would be a king, such as the king of Jordan or the king of Saudi Arabia
Double headed arrows indicate positive or negative effects of one variable on another