Stroll through the frozen foods section of the supermarket and youll find frozen corn, peas, and beans. A Moment of Science wonders, why isnt there any frozen lettuce? 你在闲逛超市的冷冻食品区的时候，会看到有冷冻玉米、冷冻豌...
When they hear the name Ben Franklin, many folks think of the Declaration of Independence, the Continental Congress and things like that. Not as many people remember that Franklin was an inventor . . . and a good one, too! He also did some pioneering...
Imagine getting on a train at twelve noon and heading out on a four-hour trip to another town. 设想一下：您正乘坐一辆中午12点整出发的火车前往另外一个城市，路途耗费4个小时。 You'd expect to arrive at four o'clock i...
You've just opened a bottle of wine for dinner. On the label, you see these words: Contains Sulfites. What are sulfites? And what are they doing in your wine? 设想一下，你在晚餐时刚刚打开了一瓶酒，你会在酒瓶的标签上看到：...
When you have a cold or flu, the doctor (or Dr. Mom) may tell you to drink lots of fluids. But did they ever explain why you need to guzzle all that water and juice? The extra fluid helps prevent dehydration, which can make you feel even worse, and m...
In 1969 when Neil Armstrong said That's one small step, he made a lasting impression. On the moon, that is. 1969年阿姆斯特朗的那句人类一小步。给人留下了难以磨灭的印象。 Marks on the surface of the moon don't disappear the...
You may have heard that humans and chimpanzees have something like 96 percent of our DNA in common. So why, then, are diseases like cancer so common in humans but so rare in chimps? If our DNA is nearly identical, shouldn't we be at risk for many of...
Few minor injuries are as painful as the dreaded paper cut. Just thinking about it probably makes you cringe. However, these cuts are usually small, hardly noticeable, and rarely bleed. So what makes them so painful? 很少有一些小伤能够像被纸...
Today's program is about an effect that not only have we all witnessed, but have participated in. Haven't we all been on an elevator and noticed that just about everyone stops talking when they get on? Why do we do that? You can be having a perfectly...
During the last ice age, rapid swings in temperature occurred within decades or less, meaning populations of organisms had to adjust quickly to new environments or face extinction. 在最后一个冰河世纪中，温度在数十年甚至更短的时间...
