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.
In December 2007, Americans had $12.37 trillion in total debt and $839 billion in credit card debt. [2] Total debt is expected to surpass the 2007 number by the end of 2016 due largely to mortgages and student loans. Thatâs not a surprise, considering the increase in costs for housing and education described earlier.