Global
Division 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.
Multiplication 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.
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.
Map with Many of the Protests in Puerto Rico and the World 2019
An event in Puerto Rico that captured world attention and motivated the interest of many Puerto Ricans in the diaspora to participate was the Summer of 2019 movement.
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.
Economic Diplomacy in the Caribbean Since the Second World War
Economic affairs are an essential part of world history and, even more so, in contemporary times after World War II, when globalization processes with higher levels of interdependency and proximity among individuals and countries are increasingly observed.
One Voice SOMOS Live! A Concert for Disaster Relief
Several Caribbean public figures (Puerto Rican artists Jennifer López and Marc Anthony and baseball player Alex Rodríguez) served as ambassadors of the Greater Caribbean before the world, to raise funds to address the immed
Solidarity Expressions from the Puerto Rican Diaspora
An event in Puerto Rico that captured world attention and motivated the interest of many Puerto Ricans in the diaspora to participate was the Summer of 2019 movement.
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.