Crazy inventions

There is no end to the extraordinary items dreamed up by inventors – a self-raising hat (1896) for the polite man with his arms full; spectacles for chickens to protect their eyes from other fowl that might attempt to peck them (1903); an automatic haircutter (1951); a motorized ice cream cone (1998) which rotates against the tongue. Here are some other examples.
Parachute fire escape
This invention was patented in 1879 by Benjamin B. Oppenheimer of Trenton, Tennessee, USA. It was made up of a parachute attached to a helmet and padded shoes that would allow a person to leap out of a blazing building and land safely – if he was lucky enough not to break his neck.

Spider ladder
This invention was perhaps not so crazy for people who are scared of spiders. British inventor Edward Doughney’s 1991 patent helps spiders to climb out of a bath.

Elephant springboard
A British patent was issued to E. Wulff in 1904 for a springboard that would make an elephant turn a somersault. The animal’s heavy landing was problem that Mr. Wulff failed to solve.

How can we measure things about the stars?

The distance from the earth to the nearest star is four and one half light-years. A light – year is about six million million miles – or 6,000,000,000,000 miles! Now, if the stars are this vast distance away from us, how can we measure how big they are, what they’re made of, and so on? At one time, the only instrument the astronomers had was the telescope. Today, a whole group of special instruments exists to help astronomers study the motions, brightness, color, temperatures, and composition of the stars. First of these is the camera, which is used to make permanent records of the stars observed. Another instrument is the spectrograph. This is used to photograph the spectra of the stars, or the rays of light coming from them. With the help of the spectrograph, astronomers have learned most of what they know about what the stars are made of, their temperatures, and the speeds at which they are moving.

Leonardo da vinci

Italian genius Leonardo da Vinci (1452-1519) is best known as a painter, anatomist, sculptor and architect. His paintings The Last Supper and Mona Lisa are among the most famous of all time. But he is also hailed as one of the greatest inventors who ever lived. Among his notebooks he left plans for countless advanced machines, often with descriptions written in secret mirror writing. Many of them were never built, but they anticipated modern inventions, often by hundreds of years. They include the following:
Air conditioner, Alarm clock, Ball-bearings, chemical and biological warfare, clock with minute and four hands, crane, diving suit and diving bell, double –hull ship, dredging machine, flying machine, gas mask, gears, giant catapults and crossbows, helicopter, lifebelt, magnetic compass, mechanical musical instruments, milometer, multi-barreled machine gun, one-person battleship, parachute, pedometer (for measuring walking distance), revolving stage, screw-making machine, shrapnel bomb, spectacles, steam engine, tank-like armored vehicle, telescope, water clock, water turbine

Something about Mangoes Seeds

Mangoes can easily propagate from seeds. But to ensure good quality, ‘inarching’ or simple grafting is commonly practiced in most states of the country. A shoot from a suitable parent tree is united to a potted seedling. This graft is carefully nursed for about one year and is then planted out in the garden. Here, it gradually grows into a graceful dome-shaped form, and four years after, the tree is ready to bear fruits. The grafted tree bears good fruits for about fifty years. On the other hand, a seedling tree—grown out of a seed—takes about ten years to bear fruits but has a longer fruitive period than the grafted one.
The tree grows well in humid as well as dry climates. Rain, fog or cloudy weather at the time of flowering affect fruit-setting. Similarly, heavy rains during the maturing and ripening of the fruit cases damage to the crop. In South India, the tree starts flowering in December-January while in North India, flowering takes place late—mid February to mid March. After flowering, it takes about ninety days for the fruit of ripen.

How many kinds of mangoes are cultivated in India?

It is estimated that about a thousand varieties of mangoes are grown in various parts of India, each variety characterized by its own peculiar taste and flavor. The number of wild varieties is unknown. Of the cultivated kind, thirty varieties of are commercially well known. Some of them are the Duseheri or Dashehari; the Langra and the Chausa of the North; the Alphonso and the Kalepad of the west; the Baneshan (Bangan-Palli); the Jahangir (Umdra); the Imam Pasand and Neelum of the South and south-east; and the Gulab-Khan and the Malda of the east. Quite often one single variety assumes several different names as orchardists like to consider each seedling as a new ‘variety’ and to Christen it with exotic new name. One can call it by any name, but a mango is always delicious.
Although the mango is now cultivated in several countries of the world, no where else has it achieved the prime position it enjoys in India. It occupies about 70% of the total area under fruit cultivation in this country. The State of Uttar Pradesh has the largest area under mango cultivation where 150 varieties of mangoes are grown. Bihar comes next followed by Andhra Pradesh.

Another four elements

Helium

Helium is twice as heavy as hydrogen, but it is still only one seventh the weight of air. Unlike hydrogen does not burn, so it is used in modern airships.

Lithium
Lithium was discovered in 1817 by Swedish scientists Johan August Arfvedson. It takes its name from the Latin word for rock, although it is actually a metal. Lithium is so light (42 times lighter than the heaviest element, osmium) and so soft that it can be easily cut with a knife. It floats because it is half as heavy as water, and lighter than some types of wood. It is used to make lithium batteries.

Potassium and sodium
Both are discovered in 1807 by Sir Humphry Davy. Both are metals that are lighter than water. In a laboratory, potassium is usually kept in paraffin because if it comes into contact with water it releases hydrogen and generate so much heat that it catches fire.

1980s and 1990s

By 1981 the ARPA network had 213 hosts (sites to which users could connect). A new host was added approximately every 20 days. In 1982 a common language called TCP/IP was invented which allowed all internet computers to communicate with each other and the network was first called an internet. In the 19802s many more people and businesses began to use computers. The internet began to be used commercially, as well as by governments and universities.
In 1991 the World Wide Web (www) was created. It combined words, pictures and sounds in a system that ordinary people could easily understand and use. By 1994 approximately 40 million people were connected to the internet. They could exchange information, sell goods, and work form any computer with a phone call. The rolling stones rock group even broadcast a concert over the internet. Schools started using the internet as an electronic library. By 1996 users in almost 150 countries around the world were connected to the internet