Science/ Technology
Engraving of a Rechentisch (Counting Board)
This image of an engraving depicts a man using a rechentisch, or counting board, the earliest known counting device and a precursor the abacus. The earliest known counting board is the Salamis Tablet, dating from 300 BCE, but may have been used more for gaming than for calculating.
Nok Terracotta Sculptures
Nok terracotta sculptures are the earliest-known sculptures from sub-Saharan Africa, created by the Nok culture of which little is known except their ironworking and terracotta sculptures that flourished circa 1500 BCE to 1 BCE.
Huaca Pucllana, Ancient Pyramid in Peru
Huaca Pucllana is a pyramid site built around 500 AD by the Lima culture of Peru. The pyramid was built with seven platforms made from adobe bricks and is around 82 feet (25 meters) high, and has a plaza surrounding it. The pyramid was a site of ceremonial and religious power.
Cueva de los Manos, Rio Pinturas
Cueva de las Manos, Rio Pinturas is an archealogical site and World Heritage Site in Argentina that features cave art and rock are that dates to around 9500 to 13000 years old.
History of Pre-Modern Math
Before the widespread adoption of Arabic numerals, medieval and early modern Europeans added, subtracted, multiplied, and divided using a type of abacus known as a counting board and only afterwards recorded the results of their ca
Adding and Subtracting with an Early Modern Counting Board
Before the rise of literacy rates, counting boards such as the one featured in the video were the most common way to perform arithmetic. After pen-and-paper arithmetic replaced counting boards, Arabic numerals also became dominant throughout Europe.
Short Teaching Module: Science, Technology, and the U.S. Military-Industrial Complex during the Cold War
For decades, the relationship between science and the U.S. government during the early Cold War years was understood largely as a story of a militaristic state persecuting and co-opting scientists and scientific institutions to serve national security interests.
Harvard Physics Department asserts that investigations threaten national security, 1950
This document is the response of the Harvard University Physics Department to a proposed Congressional amendment in 1950 requiring that the FBI investigate scientists’ “loyalty” before they could receive government contracts.
National Academy of Sciences objects to political persecution of Condon, 1948
This document from 1948 expresses concern by members of the National Academy of Sciences (NAS) over the political persecution of Edward Condon, a physicist and director of the Bureau of Standards.
AAAS Defends Edward Condon from HUAC, 1948
This document from 1948 circulates to members of the American Academy of Arts and Sciences (AAAS) the organization’s position on the political persecution of Edward Condon, a physicist and director of the Bureau of Standards.