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Short (3 to 7 mins) videos about famous numbers and cool graphics eg batman curve, kanji symbols for numbers etc. Very good for enrichment, but the presenters are sometimes a bit geeky.

some bloke from jis has been making videos for a few years for IBHL. In fact he has tried doing the flipped classroom with mixed results. Anyway there are tons of videos here that we could point students towards

Aquarium design.  Volumes, trigonometry, surface areas in careers. Video.  Also has hands on activities.  Possible project idea.

Dozemal sysem (base 12) video by Numberphile to commemorate 12.12.12 today.

Video on basic simple and compound interest. Good for IB math studies, and perhaps middle school math.

pretty much logger pro for the iphone or ipad, it lets you export the file to logger pro on the laptop as well

Humourous historical perspective on why we use x as the unknown in algebra.