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.
As of December/2010, the United States owed China $1.164 trillion. There is currently $4.3 trillion owed to countries such as China, Japan and the United Kingdom. China owns roughly 27% of this total. The United States currently has a public outstanding debt total of over $14.1 trillion.Of this total, China owns roughly 8%. Interesting note-it initially appeared as though China was slowing down their purchases of US debt in 2010.The United Kingdom, on the other hand, was rapidly ramping up their purchases-so much so, in fact, that the United Kingdom's holdings of US debt increased over 200% in 2010.s you are likely well aware, the United States has a staggeringly high public debt load. At the time that this article was written, the total US public debt load was approximately $14.1 trillion.