Posts tagged ‘climate’

How can birds perch on electric wires without getting shocked?

Birds

A bird does not receive a shock when it lands on an electric wire because it lands on only one wire.  Electricity takes the path of least resistance—it flows through some materials much more easily than others.

It is simply easier for the electricity to continue along the metal wire than it is for it to detour through the bird.

If the bird landed on two wires with different voltages, however, the electricity would flow through the bird from the wire with the higher voltage to the wire with the lower voltage, and the bird would be electrocuted.–Dick Rogers

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Why does a camel have a hump?

Camel

The camel’s best known feature is the hump on its back.  The camel’s hump is mostly fat that provides nourishment when food is hard to find.  When a camel goes a long time without food, its hump shrinks.  After it has eaten and rested, its hump becomes plump and firm again.

People once believed that a camel stores water in its hump.  Now we know that a camel simply conserves its body moisture, rather storing an extra water supply.  It can travel for days without food or water because of its fatty hump and its efficient water conservation. – Dick Rogers