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 has the largest debt in the world but other countries face more dire situations. By Danielle Kurtzleben, Staff Writer | Jan. 28, 2011, at 3:11 p.m. As the United States inches closer to its current $14.3 trillion debt ceiling, policymakers are renewing the public debate over government borrowing and spending.