The ethical consideration that must be addressed when a new
vaccine is being tested or before it is released to the public is that the
disease should be tested in order to provide safety and success. Before it has
to be tested on humans, it is best to have animal testing to ensure its safety.
There was no single event that ended the Great Depression, but most would agree it was a combination of New Deal policies, and World War II (which created soaring demand for materials and thus jobs in the United States) that ended the Great Depression.
The Fertile Crescent is the region in the Middle East which curves, like a quarter-moon shape, from the Persian Gulf, through modern-day southern Iraq, Syria, Lebanon, Jordan, Israel and northern Egypt. The term was first coined in 1916 by the Egyptologist James Henry Breasted in his work Ancient Times: A History of the Early World, where he wrote, “This fertile crescent is approximately a semi-circle, with the open side toward the south, having the west end at the south-east corner of the Mediterranean, the centre directly north of Arabia, and the east end at the north end of the Persian Gulf."
The social science that studies group behaviour is Sociology.
Sociology studies societies, how they develop and how people interact in the societies,what social order is, and other related questions.