The carbon dioxide gas given ____ by the fermenting vat was known as "fixed air".

Ever since the first prehistoric stone tools, ____ have lived in a world shaped by invention.

Mark the letter A, B, C, or D to indicate the correct answer

In 1886 in the United States, a pharmacist named Dr. John Pemberton tried to invent a medicine because he wanted a cure for ____.

The key ____ inventive success often requires being in the right place at the right time.

An invention developed ____ one purpose will sometimes find use in entirely different circumstances.

Inventor, a person who brings ideas or objects together in a novel way to create an invention, something that did not exist before.

It's hard to credit just one person with the invention of television, but it's indisputable that John Logie Baird was the first to transmit moving pictures.