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Big ideas.

Your article "Life on the Scales" (SN: 2/12/05, p. 106) reminded me that taking a bird's song and transposing it down four octaves makes it sound like a whale's song. The opposite is also true. To hear this, go to http://www.mind.net/music/ birdwhaleDemo.mp3.

TODD BARTON, ASHLAND, ORE.

The article would imply that the only anomaly to the theory that mass equates to longevity is that large-dog breeds live shorter lives than small ones do. I would suggest that there are many more discrepancies. For example, humans outlive elephants, horses, and cows, and tortoises outliving humans. And amoebas outlive us all.

MCCLELLAN BLAIR, INDIANA, PA.

This is tremendously interesting. The scaling law is evidently expressible in a single formula. Why not present it?

PATRICK J. ROACHE, SOCORRO, N.M.

Here's the equation, I = [i.sub.0] [M.sup.3/4] [e.sup.-E/kT]. I is an individual's metabolic rate, [i.sub.0] is a normalization constant, M is mass, E is the activation energy, k is Boltzmann's constant, and T is body temperature in kelvins.--E. KLARREICH
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Author:Klarreich, E.
Publication:Science News
Article Type:Letter to the Editor
Date:Apr 9, 2005
Words:183
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