How bright are you?

Who hears the speaker first, the people at the back of the auditorium, or the people 3,000 miles away who are listening to the broadcast of the speech?

A bookworm began to nibble through the pages of two books standing upright on a bookshelf. It started at page 1 of Volume One, and nibbled through to the last page of Volume Two. The pages of each book were exactly one inch thick and the bindings were 1/8 in. thick at the front and 1/8 in. thick at the back. How far did the bookworm travel?

A jet aircraft took. off from London airport at 11.00 GMT on a Saturday morning. It flew at 30,000 feet at 500 miles per hour on its way to New York. At exactly the same time, another aircraft, "Boeing 707," took off from Kennedy Airport, New York, on its way to London. It flew at 30,000 feet at 600 miles per hour. The distance from London to New York is 3,000 miles. Over the Atlantic, the two planes passed each other. At that point which of the two planes was nearer to London?

Do you know that…?

The standard unit of mass is the Kilogramme, a block of platinum preserved at the International Bureau of Weights and Measures near Paris.

Two copies of this kilogramme are kept in the Vaults of the US Bureau of Standards. The kilogramme is divided into one thousand equal parts called grammes.

The standard metre is a platinum-iridium bar which is kept in the Vaults of the International Bureau of Weights and Measures near Paris (France).

When the standard metre was first devised it was intended that it has a length equal to one ten-millionth part of the distance from one of the earth's poies to the equator.

The standard metre is usually divided into!00 equal parts. Each of these parts is called centimetre.

The centimetre is divided into ten equal parts. Each of these parts is called millimetre.

1 centimetre = 10 millimetres

The millimetre is divided into 1000 equal parts. Each of these parts is called a micron.

1 millimetre = 1000 microns.