#2316: Hair Growth Rate
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Transcript
[White Hat and Ponytail are walking to the right.]
White Hat: The average head has about 100,000 hairs.
White Hat: And hair grows at about ½" per month.
White Hat: Plus or minus.
Ponytail: Okay...
[They continue to walk while White Hat lift a hand up palm up.]
White Hat: So our heads are producing an inch of hair every minute.
Ponytail: I see.
[They continue to walk.]
Ponytail: I'm just glad it's evenly distributed. It would suck if we grew a single new five-foot-long hair every hour.
[White Hat and Ponytail are seen in silhouette from a distance. White Hat has lifted a finger up and while Ponytail has thrown both her arms out to the sides.]
White Hat: Hmm, would the hair grow steadily, or would it suddenly shoot out 5 feet on the hour?
Ponytail: If the latter, what noise would it make?
Ponytail: Ziiip? Pwiff?
White Hat: Fwip?
Ponytail: Blip.
White Hat: Zhooop.
Ponytail: Pew!
(Sourced from explainxkcd.com)
Title text:Hourly haircuts would be annoying, but they'd be easier to do yourself, since you'd have adjacent hairs as a guide. Growing it out would be a huge pain, though.