What Is the Whispering Gallery of St Paul’s Cathedral?
The whispering gallery is one of the most famous features of Sir Christopher Wren’s great master piece, St. Paul’s Cathedral in London. It is the place...
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Why Do Bats Make High-pitched Sounds?
Bats use high-pitched squeaks called ‘ultrasounds’ to find their way about. They are nocturnal animals. That is they move about by night. So they have developed their...
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How Do Bats Ply in the Dark?
A bat can fly in total darkness and yet never bump into anything. The bat has a built-in radar system. As it flies through the dark, it utters a twittering sound that...
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Are Bats Really Blind?
No, bats are not blind. In fact, some can see very well. Bats do, however, come out mostly at night. They are not equipped with special eyesight possessed by other...
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What Causes an Echo?
An echo occurs when sound bounces back from an object. When we speak or shout, sound waves travel through the air. We first hear the sound when the waves reach our...
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