The first one.......

Hi people, do you know who invented kevlar, if not! Let us know that... It was invented by Stephanie Kwolek, who was born in New Kensington, Pennsylvania in 1923. Upon graduating in 1946 from the Carnegie Institute of Technology (now Carnegie-Mellon University) with a bachelor’s degree, Stephanie Kwolek went to work as a chemist at the DuPont Company.
Stephanie Kwolek’s research with high performance chemical compounds for the DuPont Company led to the development of a synthetic material called Kevlar which is five times stronger than the same weight of steel. Kevlar, patented by Kwolek in 1966, does not rust nor corrode and is extremely lightweight. Many police officers owe their lives to Stephanie Kwolek, for Kevlar is the material used in bullet proof vests. Other applications of the compound include underwater cables, brake linings, space vehicles, boats, parachutes, skis, and building materials.
Stephanie Kwolek is truely a modern day alchemist.

The invention of the explosive led to the major disasters, wars etc., An explosive is a substance or a device that produces a volume of rapidly expanding gas that exerts sudden pressure on its surroundings. Black powder was the first invented explosive It is unknown who invented the black powder. Black powder also known as gunpowder is a mixture of saltpeter (potassium nitrate), sulfur, and charcoal (carbon). It originated in China around the tenth century and was used in fireworks and signals. Black powder is the oldest form of a ballistic propellant and it was used with early muzzle-type firearms. Being a mechanical explosive that is messy, black powder was eventually replaced by cleaner smokeless powder explosives. But these explosives should not be replaced; they should be fully eradicated for the peace of the world…

Turtle was the world's first submarine used in battle. It was invented in Connecticut in 1775 by American Patriot David Bushnell as a means of attaching explosive charges to ships in a harbor. Governor Trumbull recommended the inventor to George Washington and although the commander in chief had doubts he provided funds and support for developing and testing the machine.

The submarine was designed as a naval weapon, and it was meant to drill into a ship's hull and plant a keg containing 130 pounds of gunpowder, which would be detonated by a time fuse. Much testing was done by the inventor's brother, Ezra Bushnell, in the waters of the Connecticut River.

Named for its shape, Turtle resembled a large clam as much as a turtle; it was about 8 feet long (according to original specs), 6 feet (1.8 m) tall, and about 3 feet (0.9 m) wide, consisting of two wooden shells covered with tar and reinforced with steel bands. It submerged by allowing water into a bilge tank at the bottom of the vessel and ascended by pushing water out through a hand pump, similarly to the use of spear sack tanks in modern submarines, and was propelled vertically and horizontally by hand-cranked propellers, the first recorded use of the screw propeller for ships. It also had two hundred pounds of lead which could be released in a moment to increase buoyancy. It was manned and operated by one person. It contained enough air for about thirty minutes and had a speed in calm water of about three miles per hour.

Six small pieces of thick glass in the top were the only source of natural light. After Bushnell pondered the problem of lighting the inside of the ship and after learning that using a candle would hasten the use of the limited oxygen supply of the air inside, he solicited the help of Benjamin Franklin who cleverly hit upon the idea of using bioluminescent foxfire to provide illumination for the compass and depth meter. The light given by the material was said to be sufficient at night, though likely dimmer than expected, because the ship was cooled by the surrounding sea water and the metabolic rate of poikilothermic, heterotrophic organisms is temperature-dependent.

Thus he (David Bushnell) gave the life to a under water weapon, which is now grown into a giant to destroy a whole ship and even also the harbors. Thus it can be also said as the “Tiger of the oceans”…

Body odor is the main problem for both men and women….. The concept of Deodorant solved this problem. Mum was the first commercial underarm deodorant. The original formulation for Mum deodorant was invented in 1888, by an unknown inventor from Philadelphia. Generally recognized as being the first ever commercial product to prevent odor, the inventor promptly trademarked his invention and distributed it through his nurse under the name of Mum. In the late 1940s, Helen Barnett Diserens joined the Mum production team. A suggestion by a colleague inspired Helen to develop an underarm deodorant based on the same principle as a newfangled invention called the ballpoint pen. This new type of deodorant applicator was tested in the USA in 1952, and marketed under the name of Ban Roll-On.

Bye bye odor…

The atomic bombings of Hiroshima and Nagasaki were the first nuclear attacks at the end of World War II against the Empire of Japan by the United States at the order of U.S. President Harry S. Truman on August 6 and 9, 1945. After six months of intense firebombing of 67 other Japanese cities, the nuclear weapon "Little Boy" was dropped on the city of Hiroshima on Monday, August 6, 1945, followed on August 9 by the detonation of the "Fat Man" nuclear bomb over Nagasaki. These are to date the only attacks with nuclear weapons in the history of warfare.

The bombs killed as many as 140,000 people in Hiroshima and 80,000 in Nagasaki by the end of 1945, roughly half on the days of the bombings. Since then, thousands more have died from injuries or illness attributed to exposure to radiation released by the bombs. In both cities, the overwhelming majority of the dead were civilians.

Six days after the detonation over Nagasaki, on August 15, Japan announced its surrender to the Allied Powers, signing the Instrument of Surrender on September 2, officially ending the Pacific War.

All the wars will surely end in a bad result for any one of the two fighting countries… But this war(Pacific war) made the whole world become sad after the nuclear bomb drop in Japan…… Lets hope there will be no wars here after…

Info about bomb dropped on Hiroshima...

The release at 08:15 (Hiroshima time) was uneventful, and the gravity bomb known as "Little Boy", a gun-type fission weapon with 60 kg (130 pounds) of uranium-235, took 57 seconds to fall from the aircraft to the predetermined detonation height about 600 meters (1,900 ft) above the city. Due to crosswind, it missed the aiming point, the Aioi Bridge, by almost 800 feet and detonated directly over Shima Surgical Clinic. It created a blast equivalent to about 13 kilotons of TNT. (The U-235 weapon was considered very inefficient, with only 1.38% of its material fissioning.) The radius of total destruction was about 1.6 km (1 mile), with resulting fires across 11.4 km² (4.4 square miles).

Info about bomb dropped on Nagasaki...

On the morning of August 9, 1945, the U.S. B-29 Superfortress Bockscar, flown by the crew of 393rd Squadron commander Major Charles W. Sweeney, carried the nuclear bomb code-named "Fat Man", with Kokura as the primary target and Nagasaki the secondary target.

Have any one had ever thought about the first invented Band-Aid while any one wearing a band to heal any wound…. It was invented by Dickson… Let us know some info about the invention of this Band-Aid. Earle Dickson was employed as a cotton buyer for the Johnson & Johnson when he invented the band-aid in 1921. His wife Josephine Dickson was always cutting her fingers in the kitchen while preparing food.

At that time a bandage consisted of separate gauze and adhesive tape that you would cut to size and apply yourself. Earle Dickson noticed that gauze and adhesive tape she used would soon fall off her active fingers. He decided to invent something that would stay in place and protect small wounds better.

Earle Dickson took a piece of gauze and attached it to the center of a piece of tape, and then covered the product with crinoline to keep it sterile. His boss, James Johnson, saw Earle Dickson's invention and decided to manufacture band-aids to the public and make Earle Dickson vice-president of Johnson & Johnson.

Say thanks to Dickson….