"It" is used to describe something undefined.
In science, you may never use "it" in an experiment because when another scientists is reading the results, they will not know what is being talked about.
Window shutters were thought to be invented in ancient Greece. They were originally made of marble and used for ventilation, controlling light, and protection from weather and the outside environment.
The windsock was invented in the early 20th century, around 1915, by Albert J. Lindstrand, a Swedish aeronautical engineer. It was originally used in aviation to indicate wind direction and strength for pilots during takeoff and landing.
The stethoscope was invented by René Laennec, a French physician, in 1816. He originally used a rolled-up paper tube to listen to heart sounds and later refined the design into the modern stethoscope that is commonly used by healthcare professionals today.
Starburst candies were invented in the United Kingdom in 1960 and were originally called Opal Fruits. They were introduced in the United States in 1967.
Tinsel was invented in Germany in the early 1600s. It was originally made from real silver, but was later replaced with less expensive materials like lead and tin due to cost. Tinsel was used to enhance the beauty of Christmas trees and decorations.
The key was originally invented by Theodore of Samos and was originally used for securit purposes.
The Microwave was used to cook food.
Graphite was originally used for pencils until a mixture of lead and clay was invented in 1795.
To transport goods and people.
they used the radio to tell people news
the mp3 player was originally made to listen and store music
it was used to play games and take it with you
Gauze was invented in Palestine and was traditionally woven from raw silk. It was originally used for clothing, but is now used for medical dressing usually.
It was used for emotional and forensic testing. It was invented in 1921 by Hermann Rorschach.
that time robot was make to do work and for fashion show
the sponge wasn't invented by man but remodelled. originally people used sea sponges. from a kiwi girl of knowledge
The first Lamborghinis were tractors, built after World War II.