Heres how Knab explained it: males gather around some landmarka cornstalk, perhaps the head of an unsuspecting humanand wait for eligible females. When a female enters the swarm, the males immediately pick up her flight tone, which is different from...
Why are there no restaurants on the moon? Great food. No atmosphere. The atmosphere is the layer of gases that surrounds a planet or other massive body. Although our atmosphere extends for tens of miles, almost ninety-nine percent of it is within eig...
Take two nails and scrape them together vigorously. Now touch the place you were scraping. Its hot! Let them cool and try it again. Its hot again! You could do this all day and the nails would never stop growing hot. If heat were a liquid, there woul...
At one time it was believed that heat was a liquid. Sure, that sounds kind of crazy, but if you think for a second, you might see why. Suppose you have an object thats very hot say a metal spoon thats been sitting in hot coffee. Pick it up and you ca...
Plants attract fruit eaters，or frugivoresby packing valuable resources into their fruits like sugar and water or important nutrients such as carotenoids, vitamins and minerals. Plants often target specific animals that will give their seeds the bes...
Usually a green, sour fruit is just a fruit thats not ripe yet. If you left a lime on the tree longer would it eventually change color and become sweet, like an orange? Actually, limes do become much more yellow and less sour as they ripen. Under rip...
But if you kept recycling urine by urinating and drinking it multiple times, wouldnt those minerals eventually build up until the urine was no longer safe? Over several days, your urine would become saturated with minerals. And drinking it would real...
Time go again to the A Moment of Science mailbag. A listener writes: Dear A Moment of Science, Is it OK to drink urine? Not that I want to, Im just curious. Well, the short answer is yes if youre trapped somewhere without water, you can drink your ow...
Why is that? Its because the edges of the spill are where the fluid is at its thinnest. A spill sitting on a flat surface is something like a pancake. Big in the middle and thin on the rim. As the thin edges evaporate, they are replenished by liquid...
Next time you spill a little, let the coffee dry before wiping it up. Youll notice that after it dries there is a darkish ring around the very edge of the spill, whereas the middle disappears almost entirely. Whats going on here? Robert Deegan and Sy...
However, the effect was short lived. Within three months, both groups of callers were more or less equal when it came to how many had remained smoke-free. The researchers are optimistic, though, that continuous positive messages about the benefits of...
We all know that smoking is unhealthy. But whats the best way to get someone to quit? By harping on the dangers of lighting up, or by touting the benefits of kicking the habit? According to one study, being positive may be the best approach. The rese...
But its worth trying to eat less. In one study, researchers used computer models to see how less salt could affect teens health. One result showed that reducing salt consumption by as little as half a teaspoon a day could lower teens risk for high bl...
I know its a good idea for adults to watch how much salt they eat, especially if theyre at risk for high blood pressure. But what about kids? Should parents cut back on how much salt their kids eat, too? Good question and the answer is yes, at least...
No matter what your cell was doing before, it will stop its healthy functioning and make only viruses, following the viral recipe until it runs out of raw materials. Then your once healthy cell bursts open, releasing new viruses to infect more cells....
