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If efficiency was the only reason people did anything, life would be fantastically boring.

Besides, this is an awesome way to give a visual of what exactly a wave is. I'll have to remember this one for sure!

For those seeking efficiency, accuracy, rigor, error bounds, confidence intervals, sigmas and such: get over it. This is fun; pure fun; a great way to teach your kid how cool science is.

couldn't agree more; especially at a time where education is getting increasingly 'pointless'to kids who sometimes think (often correctly) they can get a more educative experience online.

Finding the value from an authority is not the same as deriving the value.

Get ye back to remedial science education.