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.
Hereâs a primer on the U.S. national debt, the debt limit and interest payments on the nationâs credit line: 1As of July 31, the federal governmentâs total debt stands at $19.845 trillion, according to the Treasury Departmentâs monthly reckoning.