Backpacks
A backpack can be a very convenient way to carry books and school supplies that you need w...
Humans have tried for centuries to find a successful repellant to use against mosquitoes. Native Americans used to cover their bodies with goldenseal root to protect themselves from mosquito bites. Today, in back yards across America, candles made from citronella oil are brought out by the dozens to ward off the pesky mosquito. Now researchers have identified a natural remedy that comes from chemicals secreted by frogs. Frog skins are thin, delicate membranes that are especially adapted for the absorption of water from the environment. This fragility makes them vulnerable to predators and parasites. In response frogs have developed the ability to produce chemicals that act as natural repellants. Recent studies have shown that these repellants are effective against mosquitoes. The only known downside of the frog skin repellant is the smell; some of the frogs' secretions stink of rotting meat, which researchers say helps keep biting insects at bay.
A backpack can be a very convenient way to carry books and school supplies that you need w...
Sondra wanted to be a doctor when she grew up. Her father was a surgeon, and he was able t...
Each year, many people decide to take a trip on their bicycles. The trip may last for seve...