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 problem for the U.S. is they owe China so much debt,' he [Shi Yinhong, director of the Center on American Studies at Beijingâs Renmin University] said, referring to the Chinese governmentâs vast holdings of U.S. Treasury bonds, estimated at about $1.5 trillion..he United States government would owe China exactly zero, if the Chinese government did not decide to buy up U.S. government debt with its dollar earnings instead of just selling them in international currency markets.