HOW FAST CAN BIRDS FLY?

It is easy to assess the speed of horses and people in races because there is a start and a finish line, but it is much harder to measure the speed of a bird in flight. Many figures have been published about the speed in flight of various birds but […]

HOW DOES A TELEPHONE WORK?

Telephones transmit speech messages along wires by means of electrical signals. They were invented as long ago as 1876. In the handset of a telephone are a loudspeaker and a very small microphone, which contains granules of carbon. When you talk into the microphone the sound waves of your voice […]

HOW DO RADIOS WORK?

Radio signals are transmitted using a carrier wave. Radio waves form part of the electromagnetic spectrum. Radio waves with the longest wavelengths are bounced off a layer high up in the Earth’s atmosphere, called the ionosphere. In this way radio messages can be bounced for very long distances. A radio […]

WHERE WERE THE FIRST CLOWNS SEEN?

Clowns were first seen in the ancient Egyptian courts around the year 2270 BCE. The comic spirit of clowning exists in just about every known culture. It is as old as civilization and makes us laugh, whatever age we are. The western tradition of clowning can be traced to ancient […]