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.
Since 1836, the United States has managed to add nearly $12 trillion dollars in debt, and this number is expected to rocket higher over the next decade. The  Panic of 1837  (and the 5 year depression that soon followed) helped to push the country back into the red, and we have never enjoyed debt-free status since.