Ruined Childhood of the Day: Who lives in a pineapple under the sea? I don't know, but it sure ain't SpongeBob SquarePants. Recreational mathematician Vi Hart (previously) puts on her overthinking cap and explains.

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This Is Informative, You Should Watch It of the Day: Turn up the volume and let recreational mathematician Vi Hart hand-hold you through the fascinating science and math of sound, frequency, and pitch.

[vihart.]

Fun With Math of the Day: Paying attention in class is for stupids. All the cool kids are doodling Inception Squiggles.

Recreational mathematician Vi Hart shows you how.

[vihart.]

Mathematical! of the Day: Happy Half Tau Day! Recreational mathematician Vi Hart bakes a pie, but not in honor of Pi Day because the pi is a lie.

[vihart.] 

Nerd Alert of the Day: Recreational mathematician Vi Hart (of doodling in math class fame) gets mathematical with a bunch of toy snakes.

[vihart.]