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.
Mae Jemison (born October 17, 1956) American physician and NASA astronaut known for being the first black woman to travel in space. Marie Maynard Daly (April 16, 1921 â October 28, 2003) The first African American woman to earn a Ph.D. in Chemistry. American inventor and engineer, best remembered for his invention of the multiple-effect evaporator. American ophthalmologist and inventor known for being the first African American woman doctor to receive a patent for a medical invention.