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Inventions of the world - Coggle Diagram
Inventions of the world
The wheel 
The wheel was invented in the 4th millennium BC in Lower Mesopotamia, which is modern-day Iraq. The Sumerians inserted rotating axles into solid discs of wood. Around 2000 BC, the discs began to be hollowed out to make the wheel lighter.
The wheel's main purpose is to allow things to roll. When the wheel spins, the object on the wheels moves more easily along the ground. The wheel and axle combination made possible early forms of transportation.
The wheel is a mechanical device that allows objects to roll. It is made up of a rim and a central disc, and there are two main types of wheels: semi-drop center (SDC) and drop center (DC).
The wheel is the round circle and the axle is the rod that goes right through the very center of the wheel to help it move and stay in place
The majority of wheels today are cast aluminum alloy, meaning they're made by pouring molten aluminum into a mold
The steam engine
The earliest steam engines were invented by Hero of Alexandria in the 1st century CE. However, it wasn't until the 17th century that attempts were made to use steam for practical purposes.
The invention of the steam engine revolutionized transportation, allowing people to travel greater distances by land and water.
Steam engines are external combustion engines, meaning they burn their fuel outside of the engine. The source of the steam is usually external to the part of the machine that converts the steam energy into mechanical energy.
A steam engine is a heat engine that uses steam to perform mechanical work. It uses the force of steam pressure to move a piston back and forth inside a cylinder. This force can then be converted into rotational force for work by a connecting rod and crank.
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The compass
The compass rose displays the four main directions on it: East (E), South (S), West (W) and North (N).
The compass was invented during the Chinese Han Dynasty in the 2nd century BCE. It appeared in Europe in the 12th century.
A compass is a tool for navigation and orientation that shows direction in relation to the geographic cardinal points. It's made up of a magnetized needle or other element that can pivot to align itself with magnetic north. The needle, which can spin freely, always points north. The pivot is attached to a compass card that's marked with the directions.
Compasses may operate on magnetic or gyroscopic principles or by determining the direction of the Sun or a star. The oldest and most familiar type of compass is the magnetic compass.
Modern liquid compasses use lamp oil, mineral oil, white spirits, purified kerosene, or ethyl alcohol as a dampening fluid.
After it was invented, compass was used for divination and geomancy for centuries
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The internet
Ethernet was invented in the mid-1970s by researchers who wanted to link multiple computers together in a single LAN.
The World Wide Web was invented by Sir Tim, a computer scientist at a Swiss particle physics lab, to help scientists share data from experiments.
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Google went live in 1998, after being conceived by Stanford Ph.D. students Sergey Brin and Lawrence Page.
The web's source code was put into the public domain by CERN on April 30, 1993, allowing anyone to use the code to build websites.