Ancient Greek units of measurement
Plethron (Greek: πλέθρον, plural plethra) is an ancient unit of Greek measurement equal to 97 to 100 Greek feet (ποῦς, pous; c. 30 meters), although the measures for plethra may have varied from polis to polis. This was roughly the width of a typical ancient Greek athletic running-track. A plethron could also be used as a unit of measured area, and reference to the unit in defining the size of a wrestling area is made by Libanius. A square plethron of c. 30 by 30 meters was used as the standard dimensions of a Greek , since such competitions were held within the racing track in ancient Greece. In other connotations, it functioned as the Greek acre, and varied in size to accommodate the amount of land a team of oxen could plow in a day. The plethron continued to be used in the Byzantine Empire, where its variant uses were ultimately codified to refer to an area defined by sides of 100 feet or 40 paces (βῆμα, bema). Ultimately, the unit came to be known as the "stremma", which continues as a metric unit in modern Greece. (Wikipedia).
From playlist the absolute best of stereolab
From playlist the absolute best of stereolab
A snow plow is a blade made of either stainless steel or carbon steel. See how they're made! Stream Full Episodes of How It's Made: https://www.sciencechannel.com/tv-shows/how-its-made/ Subscribe to Science Channel: http://bit.ly/SubscribeScience Like us on Facebook: https://www.faceboo
From playlist How It's Made
How Engineers Are Beating Nature
Metamaterials can be used to create invisibility cloaks and change how light reacts with a blanket of special elements. How were engineers able to make them? Trace explains. Read More: Squeezing Light into Metals http://unews.utah.edu/news_releases/squeezing-light-into-metals/ “Using
From playlist All About Diamonds & Graphene
ALLOTROPES - a quick definition
A quick definition of allotropes. Chem Fairy: Louise McCartney Director: Michael Harrison Written and Produced by Kimberly Hatch Harrison ♦♦♦♦♦♦♦♦♦♦ Ways to support our channel: ► Join our Patreon : https://www.patreon.com/socratica ► Make a one-time PayPal donation: https://www.payp
From playlist Chemistry glossary
From playlist the absolute best of stereolab