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.
The U.S. debt is more than $18 trillion. Foreign holders of this debt are always uneasy that the Federal Reserve will allow the dollar's value to decline so U.S. debt repayments will be worth less in their own currency.