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 federal government hit a new milestone Friday: The total federal debt now tallies more than $18 trillion. Just six years ago when President Obama took office, total debt stood at $10.6 trillion, which means it now has increased by almost $8 trillionâroughly 70 percentâduring his tenure as president.