Meet Vi Hart, our charming host. Vi is a self-labeled "mathematical musician", who burns paper instruments, cuts food into mathematical shapes, twists balloons into mathematical models, and makes mathematical music with candy buttons.

In other words, she's awesome.

**It’s Black Friday week on WonderHowTo!** Don’t miss out on all of the big sales in the Gadget Hacks and Null Byte shops. And if you’ve been wanting to take some classes without going into debt, check out our best deals on online courses for a variety of skill sets. Don’t miss out on these huge discounts:

**See Gadget Hacks’s top 10 BF sales on online courses (up to 99% off) >**

**See Null Byte’s top 13 BF sales on online courses (up to 99% off) >**

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