Top 10 inventions that changed the world

Top ten inventions that changed the world :

1. Wheel: Before the invention of the wheel in 3500 B.C., humans were severely limited in how much stuff we could transport over land, and how far. Wheeled carts facilitated agriculture and commerce by enabling the transportation of goods to and from markets, as well as easing the burdens of people traveling great distances.

2. Nail: Without nails, civilization would surely crumble. This key invention dates back more than 2,000 years to the Ancient Roman period. Meanwhile, the screw a stronger but harder-to-insert fastener is thought to have been invented by the Greek scholar Archimedes in the third century B.C.

3. Compass: The Chinese invented the first compass sometime between the 9th and 11th century; it was made of lodestone, a naturally-magnetized iron ore, the attractive properties of which they had been studying for centuries. 

4. Printing Press: The German Johannes Gutenberg invented the printing press around 1440. Printing Presses increased the speed of printing book copies.

5.Internal Combustion Engine: These engines, the combustion of a fuel releases a high-temperature gas, which, as it expands, applies a force to a piston, moving it. Thus, combustion engines convert chemical energy into mechanical work. 

6. Telephone: Alexander Graham Bell was the first to be awarded a patent for the electric telephone in 1876. The invention quickly took off, and revolutionalized global business and communication.

7. Light Bulb: Thomas Edison is credited as the primary inventor because he created a completely functional lighting system, including a generator and wiring as well as a carbon-filament bulb like the one above, in 1879.  Instead of going to bed at nightfall (having nothing else to do) and sleeping in segments throughout the night separated by periods of wakefulness, we now stay up except for the 7 to 8 hours allotted for sleep, and, ideally, we sleep all in one go.

8. Penicillin: It's one of the most famous discovery stories in history. In 1928, the Scottish scientist Alexander Fleming noticed a bacteria-filled Petri dish in his laboratory with its lid accidentally ajar. Penicillin was being mass produced and advertised by 1944. This poster attached to a curbside mailbox advised World War II servicemen to take the drug to rid themselves of venereal disease.

9. Internet: Internet is a source of knowledge, power and communicating. Mobile phones, datacards, hand held game consoles and cellular routers allow users to connect to the Internet wirelessly. We can see  people talking and walking on internet. It gives us alot of information and is accessible and affordable. We can buy thing by sitting at home and we can get latest news about anything. We can share our feelings and thoughts on internet.

10. Fridge: Before the invention of the refrigerator, ice houses were used to provide cool storage for most of the year. Placed near freshwater lakes or packed with snow and ice during the winter, they were once very common. Natural means are still used to cool foods today. On mountainsides, runoff from melting snow is a convenient way to cool drinks, and during the winter one can keep milk fresh much longer just by keeping it outdoors.