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.
U.S. NATIONAL DEBT CLOCK The Outstanding Public Debt as of 07 Oct 2015 at 05:46:24 AM GMT is: The estimated population of the United States is 321,525,284 so each citizen's share of this debt is $56,459.25..S. NATIONAL DEBT CLOCK The Outstanding Public Debt as of 07 Oct 2015 at 05:46:24 AM GMT is: The estimated population of the United States is 321,525,284 so each citizen's share of this debt is $56,459.25.