Signals

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Summer music of the trees

Summer music of the trees

I always used to think that the drive across a four kilometre stretch from my house to the main road was a pain. Actually, not all of it was a pain. The car bounced up and down a few bumpy patches the first kilometer, then zoomed across a smooth 2.

How Does Satellite TV Work?

How Does Satellite TV Work?

Nine ‘o’ clock. It’s time for your favourite serial on television. Have you ever wondered how the same serial can be viewed by millions of people across the world? This is possible because of satellite television technology.

Programmed to learn

Programmed to learn

Two boys and two girls. They were to be found at one of the busiest traffic signals in south Delhi. The boys were about five or six years of age. The girls looked older, about eight or nine.

What is Ham Radio?

What is Ham Radio?

Consider this, your state has been hit by a cyclone with wind speeds measuring 300 kilometres per hour. All modern means of communication – telephone, cellphone, wireless sets – lie dead as the cyclone has destroyed all connecting stations and links.

How do Animals Communicate?

How do Animals Communicate?

Humans have invented new and advanced ways of communicating with each other. Television, radio, telephones and of course email. You will be surprised to know that animals who seem to have very simple methods of communication – using their bodies and voices – are also capable of long distance communication.

Who Invented Traffic Lights?

Who Invented Traffic Lights?

Long before roads needed traffic lights, railways were using a system of signals to control train traffic. In the early railways, a single track was used for both up-going and down-going trains, and safety depended on spacing the arrival and departure of trains according to time intervals.

What does SOS mean?

What does SOS mean?

Recently, sailors on the nuclear submarine that sank in the Baltic Sea were isolated from rescue workers as their radio set got damaged. Luckily their radio operators knew the Morse code and were able to communicate by knocking on the sides of the ship.

The Cool Firefly

The Cool Firefly

Firefly is just a 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.

Logging on to Aliens

Logging on to Aliens

Do you believe that there might be life on other planets? Would you like to be the first ‘Earthling’ to make contact with an alien? Well, you can start your search from home. All you need is a computer and Internet access, and you can join the project of the US-based National Aeronautics and Space Administration (NASA).

Which Film Stars were Inventors Too?

Which Film Stars were Inventors Too?

Most movie fans have seen or at least heard of Hollywood legends Hedy Lamarr and Steve McQueen. But how many know that these two were inventors who have significantly changed our lives. Nobody? Not surprising.

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