The lenses of photochromic lenses are made of glass that is mixed with minute crystals of light-sensitive silver iodide or bromide. The crystals are so tiny that they have a length of only 50 angstroms, and to make its length clearer, a single angstrom is equivalent to 0.0000000001 meters. As these crystals … Read more
What could possibly happen if there was no hole in the middle of the parachute to let some of the air escape? The problems for hole-less parachutes were prominent during the First World War when paratroopers would use parachutes without holes and consequently faced two serious risks. The first risk arose when … Read more
Some decades ago there were no chemists’ shops. Instead of chemists druggists used to mix various compounds according to physicians’ prescriptions and sell them either in powder form or liquid form. Sometimes physician’s assistant used to prepare such mixture in the dispensary itself so he was known as compounder. These types of medicines … Read more
Microwave ovens have provided the mankind with the whole new way of cooking, quite unlike the conventional method followed since thousands of years. When cooking is done in a customary manner, the heat that comes from a conventional gas stove is transferred to food by conduction. The heat is passed first to … Read more
One might wonder, if hydrogen is a highly combustible gas, while oxygen helps it in combustion, then why does the combination of both of these elements as H2O or water have the ability to extinguish a fire? The answer lies in the difference between mixture and compound found in H2O. At the … Read more
For centuries, people have tried to find a method to produce gold, one of the most valuable materials in the world. Gold has been the primary method of currency for centuries, perhaps even millennia. Once, it backed United States currency, though those does are behind the country. Gold is universally valuable for … Read more
We all know the amazing throwing-stick called the boomerang, and as a kid, we probably experienced playing with it. It has a neat design, and one of its exciting features is it will return to you after you throw it. Its unique capabilities are the reason why kids enjoy playing it, and … Read more