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.
And most of this debt has been accumulated in recent decades. If you go back 40 years ago, total debt in America was sitting at about 2.2 trillion dollars. Somehow over the past four decades we have allowed the total amount of debt in the United States to get approximately 27 times larger. This is utter insanity, and anyone that thinks this is sustainable is completely deluded.