Friday, July 30, 2010

Fireflies

Level: English for Junior and Senior High School
24-hours online learning

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Fireflies
Fireflies are just name. They are actually very cool insects. And they are not even flies, they are beetles. They have a way of sending out light signals every now and then. If you see them at night on a tree, you might think it is a brightly lit Christmas tree. This is the kind of light these fireflies produce.
Fireflies have transparent abdomen. There are cells of crystals or chemical substances inside it which get broken down by enzymes. Some energy is released in the form of light. However, the light they send out does not have heat. The light is cold.
The fireflies send out light signals at fixed intervals. And the purpose behind it is to attract beetles for mating. But one firefly's signal is different from another, depending on its sex and the type of family it belongs to. If a firefly sends a signal at a fixed interval but gets a response either too soon or too late, it will ignore the signal. It is like a perfect dance sequence. If you are faster or slower than your partner, the dance fails.

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