ANSWERS: 1
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The natural bright lights in nature are the sun, moon and stars. These are very far away, so insects fly in a straight line by keeping a bright light at a constant angle. Unfortunately, man has introduced nearby bright lights. If an insect keeps a nearby light at a constant angle, it either flies rapidly into the darkness (if the angle is at greater than 90 degrees) or spirals into the light (if the angle is less than 90 degrees). The insects don't want to hang around the light at all - what they are trying to do is cross-country navigation. Man has unwittingly created a death-trap for simple minded beasts by subverting their navigation beacons.
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