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Probably dogs, but both can learn some things in about the
same time. However, they go at it, differently, as we see
watching Duma, the Bengal cat, and then Otis, the boxer, play fetch...
Readers' Question
Here's your next question:
 Since humans domesticated dogs, causing actual genetic changes in the
canines, has there been a reciprocal genetic change in humans making us more
compatible with dogs? In other words, have dogs domesticated humans as humans domesticated them?
Lanney, Sandia Park, New Mexico
Deadline: 1 April. We will publish the best
answers on 12 April.
You get the credit. Click here to give April your answer: Answer the question.
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Vibrating water molecules: a closer look
 The whole water molecule vibrates in three ways: one way like a Mickey Mouse
with flapping ears. A water molecule consists of two small atoms of hydrogen
arranged in a bent fashion about a larger atom of oxygen. The vibration brings
the hydrogen "ears" together and apart. This vibration occurs at the lowest
frequency, in the infra-red.
The other two vibrations are twice as energetic and involve a stretching of the
bonds holding the oxygen and hydrogen atoms together. Even these vibrations,
however, oscillate at heat frequencies below what we see.
Return to: Why deep-water colors look black
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