Many health researchers are dubious, though. A 2009 FDA study of e cigarettes found trace amounts of diethylene glycol a solvent linked to kidney failure. And some experts worry that because e cigarettes are marketed as being clean and safe, they may...
Probably all, or nearly all, who have experienced a cold winter, are familiar with the cheery cry of the snow as it is pressed against a hard surface by the steel tire of a wagon, for instance, or even onto a pavement by the heels of ones boots. Thos...
A skydivers body is in a delicate balance. Gravity tugs her downward with a constant, relentless force, while air resistance pushes her upward. The faster she falls, the more air resistance there is, so eventually these two forces cancel out. Then sh...
Snowflakes are small ice crystals. Snowflakes near their melting temperature can, through hand pressure, be made to fuse into a snowball by a process of melting and re-freezing. The snow yields to pressure gently and progressively and doesnt make sou...
Bread and wine make fine companions in a picnic basket, but the two have more than that in common. To make either one, the baker or the vintner has to enlist the help of yeast. Yeast isnt an important ingredient in the final product, but its the biol...
So while children who study music for two years demonstrate better verbal memory than children who have not studied music, children who continue to study music continue to improve their verbal memory. The good news for those of us who trained on musi...
How often do you change the air in your tires? How about your brake and radiator fluids? You may need to fill them up or change them once in a while, but you dont have to change them the way you have to change your oil. You should change the water in...
Acetylene and hydrogen molecules are disappearing from the atmosphere of Saturns moon, Titan. Its a mystery befitting Sherlock Holmes investigative skills, a mystery NASA scientists hope to crack. About fifty percent larger than Earths moon, Titan is...
What makes Galileo a science hero? For one thing, he moved human knowledge forward against outstanding prejudice and even persecution. Back in 1616, when Galileo argued that Copernicus had been right in suggesting the earth moves around the sun, he w...
Recipes for fudge tell you to heat a sugar syrup to two hundred and thirty degrees Fahrenheit. Taffy recipes give similar instructions, but with a temperature of two hundred and sixty-five degrees. And to make hard candy, you heat the mixture to thre...
Galileo, however, used one of the earliest telescopes to look at Jupiter. He noticed that Jupiter has moons going around it. Apparently everything in the cosmos didnt have to go around the earth! Perhaps, Galileo said, it just looks like everything m...
After a day of skiing, bicycling, or swimming, some people find they get headaches something like a hangover from drinking too much the night before. Even though exercise is healthy and excessive drinking is not, the headache in either case is your b...
Microwaves heat water by jerking the water molecules around, so to speak. Each water molecule has a slight positive electric charge on one side and a slight negative charge on the other. As microwaves pass by, they exert forces on those charges, firs...
E cigarettes are battery-powered tubes that look like real cigarettes. But instead of inhaling and getting a lungful of tobacco smoke, you basically suck in vaporized nicotine. According to companies that make e cigarettes, since theres no tobacco sm...
Many health researchers are dubious, though. A 2009 FDA study of e cigarettes found trace amounts of diethylene glycol a solvent linked to kidney failure. And some experts worry that because e cigarettes are marketed as being clean and safe, they may...
