Imagine you're camping deep in the woods on a summer night. The sun sinks below the horizon and the temperature begins to fall. You shiver, and as you pull your jacket around your shoulders, you wonder just how cold it really is. Here's a clever way...
Money Changers ever wonder how a money changer machine knows if you've given it a one, a five or a ten dollar bill? When a bill is inserted into a money changer machine, it disrupts a light beam from within the machine. 兑钞机是如何辨别塞进去...
Yeal: So, Don, when you go to Mcdonald's... 雅艾尔：那么，唐，你什么时候去麦当劳... Dan: I don't go to Mcdonald's. 唐：我不去麦当劳。 Yeal: OK, but if you did. And saw that they have salad on the menu, would you get the sal...
In 1971, the President's Council on Environmental Quality issued a report titled Toxic Substances. It pointed to a sharp increase in the amount of potentially-dangerous chemicals entering the environment from manufacturing and processsing and a lack...
Dear Annie: When I was in college, I was good friends with Carrie. When Carrie met my boyfriend, she was rather intoxicated and said some hurtful things about him. Carrie went on and on about how she couldn't believe I would date a frat boy, that I w...
f there's any one thing that really separates humans from most other animals, it's our ability to get funky. When's the last time you saw a lion, or a giraffe, or even a chimpanzee, do the Funky Chicken or the Electric Slide? But there is one other s...
The stock market crash of 1929 devastated the American economy and produced the Great Depression. Between September 1929 and July 1932, stocks lost 83% of their value, prompting the Senate Banking and Currency Committee to conduct a series of hearing...
The term Pell Grant becomes very familiar to millions of college-age students and their families every year. Pell Grants assist undergraduate low- and middle-income college students with tuition assistance grants that do not have to be repaid. In add...
It's not hard to think of moments when history was changed by someone who blew the whistle on government missteps. Daniel Ellsburg, for instance, leaked the Pentagon's secret history of its involvement in Vietnam to the New York Times and hastened pu...
How do we get into wars in the first place? The framers of our Constitution had a clear idea: They gave Congress, the branch closest to the people, the power to declare war, and the President the right to prosecute it. 我们如何发起战争呢？立...
Today's Social Security program has its roots in the Great Depression of the 1930s. With 22 million unemployed, many Americans lived in poverty, and many elderly workers lost all their pension funds when their companies went bankrupt. 如今的社会保...
The right to vote has always been fundamental to our system of representative democracy, yet most African-American voters in southern states were denied this right for almost a hundred years, despite the ratification of the 15th Amendment in 1870. So...
The federal government's concern with safe drinking water dates back to 1914, when the U.S. Public Health Service established standards for bacteria in drinking water on ships, trains, and other interstate carriers. 联邦政府对饮水安全的关注...
National parks have been called the best idea America ever had. But the idea of preserving land ran contrary to the prevailing national mood during the 19th century, which saw nature as something to be subdued and conquered. 国家公园被认为是美...
The Orphan Drug Act is not about children without parents. The term orphan drugs refers to medical products that would not be adopted by major pharmaceutical companies because they serve only a very small portion of the populationpeople with rare dis...
