Ask mr Brain...all will be epxlained

PUBLISHED : Tuesday, 22 February, 2000, 12:00am
UPDATED : Tuesday, 22 February, 2000, 12:00am

When was the first motorcycle manufactured? The first truly usable motorcycle was manufactured in 1900 by the E R Thomas Motor Company in Buffalo, New York, the United States, and was basically a bicycle with a one- cylinder engine. The engine was at tached to the bicycle bar and was connected to the rear wheel by a belt. In 1868, a man named William Austin invented a steam-powered motorcycle, but it did not work so well. And that same year, Ernest and Pierre Michaux of France built a bicycle with a steam engine just above the back wheel.

What is erasable ink made of? Erasable ink is colour mixed in with a substance similar to rubber cement.

The ink is designed so that it lays down a layer of rubber between the colour and the paper.

When you try to erase it, it rolls up like rubber cement. The colour is not really dissolved in the liquid. Regular ink has a dye or colour that is dissolved and this liquid dyes the paper's fibres.

How many living organisms are there in a human body? There are lots and lots of tiny organisms in the human body - in fact, the number of bacteria is greater than the number of cells in the body! There are more than 100 types of bacteria in the body. Bacteria tend to form colonies, and generally like specific tissue. For example, certain flu bacteria will colonise in respiratory cells.

However, many of these tiny organisms in our bodies are helpful. They can help fight off other bacteria that may cause disease, and others help us digest our food.