Chalk Isn’t Chalk and Why an Elephant’s Nose is Called a Trunk

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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=etymology+elephant+trunk&source=bl&ots=uwfRp4WfXZ&sig=wZ2wHZ3E-4W2Y4KI9vE59TQ3_WM&hl=en&sa=X&ei=OC1hVfXqOc3EogTJ1oDQBg&ved=0CGwQ6AEwCw#v=onepage&q=etymologyelephanttrunk&f=false
http://www.enotes.com/topics/john-bale/in-depth

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