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.
As of Jan. 31, 2014, the latest day reported, the debt was $17,293,019,654,983.61âan increase of $6,666,142,606,070.53 since Obamaâs first inauguration. The total debt of the United States did not exceed $6.666 trillion until July 2003.