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.
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Echoes
Why Do Bats Make High-pitched Sounds?
Why Do Bats Make High-pitched Sounds? Bats use high-pitched squeaks called ‘ultrasounds’ to find their way about. They are nocturnal ani
How Do Bats Fly in the Dark?
How Do Bats Fly 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 fl
Are Bats Really Blind?
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 equ
What Causes an Echo?
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 f