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.
Make it a challenge, and pick at least one item to cut back on. 20. Credit card interest. Currently, the average credit card debt per U.S. household is $15,270, and in total, Americans owe $856.9 billion in credit card debt, based on American Household Credit Card Debt Statistics as of January 2014.ccording to CNN, Americans spent $66.5 billion on lottery tickets in 2011, an increase of nearly 10 percent from the year before. It turns out, lottery ticket sales have increased every single year since their inception in the very first state lottery in 1965.