1 4/2 and 4/8 are also simple quadruple. 2  Notice that a time signature in simple meter will always have a 2, 3, or 4 for the top number. 3  While beats in simple meter are divided into two notes, beats in compound meter are divided into three. 4  To demonstrate this, we will examine 6/8 time.
The Discovery and Isolation of Caffeine. Caffeine has been used as a medicinal and recreational drug since before recorded history, by consumption of caffeine bearing plants. However, the discovery of the chemical did not occur until a young physician called Friedlieb Ferdinand Runge isolated and purified the white crystalline substance in 1819.
The origin of AIDS has presented numerous puzzles to scientists since the first recognized cases appeared in the early 1980s. Until 1984 its cause was the subject of fierce debate.hey concluded that the origin of the HIV isolate discovered by Gallo was the same as that discovered by Montagnier. Today it is generally agreed that Montagnierâs group was the first to identify HIV, although Galloâs group insists it contributed significantly to demonstrating that it causes AIDS.