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 US has fallen from the 6th most indebted nation (in terms of debt-to-GDP) in 2014 to 11th in 2015. This isnât necessarily great news for the US, because its debt-to-GDP ratio has actually increased to 103% from 101.5% in 2014.