Note: As Mike Yassa, the lead author on the study, pointed out to me, the study did not actually test whether consuming caffeine before a task enhances memory, the problem being that other confounding factors can then lead to difference in performances on the test.
The US debt is more than $20.1 trillion, the largest in the world. Here are the 3 reasons it grew so large, and how it damages U.S. economic growth. The US debt is more than $20.1 trillion, the largest in the world.
Government Debt to GDP in the United States averaged 61.38 percent from 1940 until 2014, reaching an all time high of 121.70 percent in 1946 and a record low of 31.70 percent in 1974. 1Y 5Y 10Y MAX.