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.
Total US Government Debt in 2016. Click image to customize chart. and view data. At the end of FY 2016 the total government debt in the United States, including federal, state, and local, is expected to be $22.488 trillion. Get more information about Total Debt here.