Maya used place value and zero in mathematics.
The Maya civilization was a Mesoamerican civilization developed by the Maya peoples, and prominent for its logosyllabic script, the most sophisticated and highly developed writing system in pre-Columbian Americas, along with its art, architecture, mathematics, calendar, and astronomical system. The Maya civilization developed in an area that comprised southeastern Mexico, all of Guatemala and Belize, and the western portions of Honduras and El Salvador.
The Greeks developed direct democracy and allowed citizens to choose their leaders and participate in decision making.
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Canada's entry into the Cold War came with the disclosure in 1946 of a spy ring led by Igor Gouzenko. Involvement in NATO and support for the UN led Canada to be an active participant in the Korean War in 1949. In 1949, the Soviet Union detonated its first atomic bomb, and the age of superpowers was launched.
The gross domestic product measures the value of economic activity within a country.
It is a printing press that is being shown, a form of machinery invented by Johannes Gutenberg around 1440 which was based around already invented screw presses. Here, a company, perhaps book or newspaper related, is busy using the printing press to making multiple copies of the same text again and again.
