The weight of a carat (200 milligrams), the standard unit of measurement for gem stones, is based on the weight of the carob seed, which was once used as a weighing standard by jewelers in Africa and the Middle East. Historians believe the word carat is derived from an Arabic word meaning “bean” or seed.
- Is a mile the same distance on land and at sea?
- How were stones used as weights and measures?
- What is a cubit?
- How are measuring units related to the human body?
- Is it possible to count to infinity?
- What is a googol?
- Why is learning math important?
- Is zero a number?
- What is an abacus, and how long has it been used?
- Which airport is the busiest in the world?
- What are Roman numerals?
- What is so special about the number 2?
- How long will it take me to count to one billion?
- Why is the number 10 important?
- What is a perfect number?
- What is Euclid’s Elements?
- Who was Pythagoras?
- Where and when did numbers originate?
- How do robots like ASIMO and Mahru work?
- Has a robot been invented to help with housework?
