Animal fat. I don't think it was a specific animal.
The raising of the real wage of England (due to the shortage of labour as a result of the reduction in population), a trait shared across Western Europe, which in general led to a real wage in 1450 that was unmatched in most countries until the 19th or 20th century.
Answer:
But the foundations of modern science were laid long before this time, and were particularly influenced by Islamic civilization. The Muslims were the leading scholars between the seventh and fifteenth centuries, and were the heirs of the scientific traditions of Greece, India and Persia.
Greece was a catalyst to Truman philosophy because the country stopped receiving financial aid form Britain. He feared that without British help, they could accept communism and help from SSSR and therefore could lead other countries from Europe to follow its example. He decided that the country has to get financial help from the USA and the rest is history.
