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.
If anyone thought that $14 trillion in 2010 debt is bad, just wait until we hit $24.5 trillion in total US national debt in 2015. And it gets even more surreal: total US Unfunded Liabilities are estimated at $144 trillion, roughly $1.2 million per taxpayer...