eMacromall.com - Science and Technology

Bifocals are eyeglasses with two distinct optical powers. Benjamin Franklin (1706 - 1790) is credited with the invention of orginal bifocal spectacle lenses in 1784.
As of 2011, nuclear power plants provide about 6% of the world's energy and 13–14% of the world's electricity. There were 439 nuclear power reactors in operation in the world, operating in 31 countries. The U.S. had 104, France: 58, Japan: 55, Russia: 32, South Korea: 21, India: 20, U.K: 19, Canada: 18 and Germany: 17. The working life of a nuclear power plant is approximately 40 years.
The first American woman in space was Sally K. Ride who was aboard Challenger STS-7 on June 18, 1983.
The first American woman to walk in space was Kathryn D. Sullivan who was aboard Challenger STS-41G on October 11, 1984.
The first American woman to make three spaceflights was Shannon W. Lucid, who was aboard STS-51G Discovery (June 17-24, 1985), STS-34 Atlantis (October 18-23, 1989), and STS-43 Atlantis (August 2-11, 1991).
The first African American to fly in space was Guion S. Bluford, Jr, who was aboard Challenger STS-8 on August 30, 1983.
Challenger STS 51L was launched on January 28, 1986, but exploded 73 seconds after lift-off.
The first U.S. satellite launched into orbit was Explorer 1, which was launched on January 31, 1958.
Bifocals, which are eyeglasses with two distinct optical powers, were developed around 1760 by the American statesman and inventor Benjamin Franklin.
The first air brake invented by George Westinghouse in 1869 revolutionized the railroad industry.
The Chinese abacus was developed about 5000 years ago.
Charles Edward Taylor (May 24, 1868 – January 30, 1956) built the first aircraft engine that provided the power to achieve the powered, sustained, and controlled flight of an airplane flying by Orville and Wilbur Wright on December 17, 1903.
In 1976, a magnitude 7.5 quake killed 255,000 people in Tangshan, China; in 2004, a 9.1 magnitude quake in Sumatra (and the resulting Tsunami) killed 227,898 in 14 countries; in 1920, a 7.8 earthquake killed 235,502 people in Haiyuan, China; in 1923, 142,000 people died after a 7.9 quake in Kanto, Japan; in 1908, 123,000 people were killed after a 7.1 quake in Messina, Italy; and in 1948, 110,000 people died after a 7.3 quake struck Ashgabat, Turkmenistan.
When an active cell phone is pressed against the ear, the brain gets busier. The human brain is sensitive to the electromagnetic radiation that is emitted from cell phones; however, the radiation emitted by a cell phone is not radioactive. Scientists don't know yet whether cell phones are bad for the brain.
Discovery, which made its debut on August 30, 1984, ended its career on March 9, 2011 as the world's most flown spaceship, returning from orbit for the last time and taking off in a new direction as a museum piece. This spaceship flew 39 missions, including flying 13 times to the space station more than any other craft, covering 148 million miles. It orbited Earth 5,830 times and spent 365 days in space.
About10.4 percent of the world's land surface (or 6,020,000 square miles) is covered with ice in the form of ice sheets, ice caps, or glaciers.
The ice that covers Antarctica is 15,700 feet ( 4,785 meters) in depth at its thickest point. Its average thickness is 7,100 feet (2,164 meters).
Of the 850 different species of tree in the U.S., the oldest species is the bristlecone pine (Pinus longaeva), which grows in the deserts of Nevada and South California. The potential life span of these pines is estimated to be 5,500 years.
An old, still healthy oak tree is estimated to have approximately 250,000 leaves.
The microwave was invented after a researcher walked by a radar tube and a chocolate bar melted in his pocket.
Supercomputers, which was originally designed by Seymour Cray at Control Data Corporation (CDC) in 1960s, are used for highly calculation-intensive tasks such as problems involving weather forecasting, climate research, molecular modeling and physical simulations and quantum physics. Today the Tianhe-1A supercomputer located in China has been the fastest in the world.
The highest recorded train speed is 320.2 mph by the TGV train in France.
The Jupiter is larger than the Earths around 1,000 times. Europa, Jupiter’s moon, is completely covered in ice.
The Earth orbits the Sun at 66,700mph. The Moon is moving away from the Earth at about 34cm per year.
There are over 100 billion galaxies in the universe. The largest galaxies contain nearly 400 billion stars.
The Sun, composed mostly of helium and hydrogen, has a surface temperature of 6,000 degrees Celsius.
The temperature at the center of the Earth is around 5,500 degrees Celsius.
Sahara (around 93,500,000 square miles) is the largest desert in the world.
Lake Baikal (Baikal) in Siberia, Russia is the deepest lake (1,620m deep) and the oldest lake (25 million years old) in the world.
The highest waterfall (979m) in the world is the Angel Falls in Venezuela.
Only 31 percent of U.S. bachelor's degrees are in science and technology, compared with 63 percent in Japan.
Take any three figure number in which the first figure is larger than the last, say 754. Reverse it, making 457 and subtract the smaller from the larger (i.e.; 754-457), making 297. Now add the result to the same number reversed, 792. The answer is (297+ 792) = 1089, and will be 1089 whatever number you start with.
111,111,111 x 111,111,111 = 12,345,678,987,654,321
1 x 9 x 12345679 = 111,111,111; 2 x 9 x 12345679 = 222,222,222; 3 x 9 x 12345679 = 333,333,333; 4 x 9 x 12345679 = 444,444,444; 5 x 9 x 12345679 = 555,555,555
6 x 9 x 12345679 = 666,666,666; 7 x 9 x 12345679 = 777,777,777; 8 x 9 x 12345679 = 888,888,888; 9 x 9 x 12345679 = 999,999,999
2,520 can be divided by 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 without having a fractional leftover.
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning. She was the first person honored with two Nobel Prizes (in physics and chemistry), and was the first woman to serve as professor at the University of Paris.
The water on the earth occupies 71 percent of the planet, but only 1 percent of this water is drinkable.
It takes 8 minutes and 12 seconds for sunlight to reach the Earth.
Florida's beaches lose 20 million cubic yards of sand annually.
One 75-watt bulb gives more light than three 25-watt bulbs.
The speed of a typical raindrop is 17 miles per hour.
Radio waves travel at 186,000 miles per second, and sound waves saunter at 700 miles per hour.
HP, Dell, Acer and Apple are top PC sellers in the U.S.; and while other three vendors gained their shares, HP continues falling.
The revolver was invented by inventor Samuel Colt. It was patented in 1836.
In 2009, the US Federal government awarded Lockeed Martin, Boeing, Northrop Grumman, Rayheon and General Dynamics the contracts with a value of $30.9B, $20B, $17.5B and $15.3 and $12.7B, respectively.