Why Dont Marks On The Surface Of The Moon Disappear? In 1969 when Neil Armstrong said Thats one small step, he made a lasting impression. On the moon, that is. Marks on the surface of the moon dont disappear the way marks on the Earth do; a great exa...
Why Do You Become Dehydrated When Sick? 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, w...
What Are Sulfites? Youve 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? 图片1 Chemical Compounds Sulfites are chemical compounds found naturall...
Why Was Greenwich Standard Time Created? Imagine getting on a train at twelve noon and heading out on a four-hour trip to another town. Youd expect to arrive at four oclock in the afternoon, right? But before the last few decades of the 19th century,...
Why Am I Still Hungry? Youve just snacked on rice cakes. Why are you still hungry? That yummy feeling of being pleasantly full depends partly on the weight and volume of what you eat. As the stomach churns away at a large enough weight and volume of...
Ben Franklin Did Not Get Struck By Lightning Did Ben Franklin really discover electricity with a kite? Everybody has heard the famous story of how pioneering experimenterand part-time founding fatherBen Franklin tied a key to a kite string and flew t...
Ben Franklin And A Very Furry Situation 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 go...
Why Lettuce Should NOT Be Frozen 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? 图片1 Why Cant I Freeze Lettuce? Freezing is a...
Ice Age Plant Survives To Modern Day Like a science fiction time traveler, an arctic plant of the late Pleistocene age, over thirty one thousand years old, is growing again after a long frozen sleep. History Narrow leafed campion (Silene stenophylla)...
Were Losing Niagra Falls! Niagara Falls has been a famous honeymoon spot for over a hundred years: some honeymooners have been more faithful to it than to each other. 图片1 When The Falls Formed Since the falls were formed during the late Pleistoce...
Why Do Dark Circles Form Under My Eyes? Its eleven oclock Sunday morning, and youve just woken up after a late night of carousing. You stumble out of bed, brace yourself on the bathroom sink and blink into the mirror. 图片1 There, under your eyes,...
What Is A Concussion? If you follow football, hockey, soccer, or boxing, then you know that athletes in these and other contact sports are at constant risk for a concussion. Every season several football players miss a number of games after absorbing...
What Is Boredom, Scientifically Speaking? Its time to go again to the A Moment of Science mailbag. A listener writes: Dear A Moment of Science, Everyone gets bored from time to time. But I was wonderingwhat is boredom exactly, scientifically speaking...
How Do Scientists Study Deadly Diseases? I have a trivia question for you, Don. What do the Ebola virus, anthrax, and the avian flu have in common? 图片1 Researching Disease After all, theyre some of the most dangerous, deadly diseases around. On t...
What Are Blisters? Remember that hit song from the 80s that featured the chorus: And I would walk five hundred miles / and I would walk five hundred more / Just to be the man who walks a thousand miles / to fall down at your door? What sounds romanti...
