Today I Found Out
Chalk Isn't Chalk and Why an Elephant's Nose is Called a Trunk (2019x250)
Fecha de emisión: Sept 18, 2019
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More from TodayIFoundOut:
When Did People Start Turning Things Up to 11?
https://youtu.be/Tc9mun4RJNg
The Bizarre Story of the Man Who Sold the Moon
https://youtu.be/GhRe_x2wByM
In this video:
Ubiquitous in many classrooms since the 19th century, chalk and chalkboards are familiar to most of us. White, powdery and prone to sticking to those surfaces where it is put (and just as easy to wipe away), chalk and its accompanying board are excellent instructional aids. Notably, however, most chalk today isn’t technically chalk at all, but gypsum.
Want the text version?: http://www.todayifoundout.com/index.php/2015/05/blackboard-chalk-isnt-chalk/
Sources:
http://www.realclearscience.com/blog/2013/10/the-most-amazing-appendage-in-the-world.html
http://www.buzzfeed.com/danieldalton/elephant-facts#.coGZP3y9l
http://animals.nationalgeographic.com/animals/mammals/african-elephant/
http://althouse.blogspot.com/2013/05/trunk.html
http://takeourword.com/TOW123/page2.html
http://www.upali.ch/trunk_en.html
http://www.etymonline.com/index.php?allowed_in_frame=0&search=trunk&searchmode=none
http://en.wiktionary.org/wiki/trunk
https://books.google.com/books?id=fXrlvr_kPXwC&pg=PA36&lpg=PA36&dq=ety
- Estrenada: Oct 2013
- Episodios: 2344
- Seguidores: 1