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.
The United States constitutes 23.3% of the world economy but 29.1% of world debt. Itâs debt-to-GDP ratio is 103.4% using IMF figures. Japan makes up only 6.18% of total economic production, but has amounted 19.99% of global debt.