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Jim Nicholls

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How do Satellites Stay Up?

Satellites orbit the earth because of the force of gravity. To understand why this happens and why the satellite does not get pulled in and fall, we have to understand what forces do. A force will change the motion of an object; it might speed it up, slow it down or change its direction. For example, if you are...

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Nikola Tesla – Unsung Prophet of Electrical Age

If you ask anyone or check up in the encyclopaedia, who invented the radio or X-rays, chances are you will never come across the...

Where Did Numerals Originate?

We deal with numbers all the time. Not just while doing math lessons at school, but also while counting money at the shop, memorising...

How does a Submarine Work?

Jules Verne in his science fiction, 20,000 Leagues under the Sea, mentions a ship, Nautilus, which could dive beneath the waves and...

An Organism that is visible from Space

The elephant is the largest land animal. The Blue whale is the largest sea animal. But however big these animals may be, they can...

Penguin Sweaters

Oil spills can have a devastating effect on marine life. After an oil spill, one of the most important jobs of rescuers is to...