Ask mr brain...all will be explained

PUBLISHED : Monday, 21 February, 2000, 12:00am
UPDATED : Monday, 21 February, 2000, 12:00am

What is a hornet's nest made of? Hornets chew wood or bark to make a waterproof, paper-like paste to make their nests. They begin the work in spring and work on the nest throughout the summer.

How many times can an earthquake hit one spot? There is no limit - one spot can be struck by several earthquakes. Earthquakes occur mostly along faults, cracks in the Earth's crust where two plates push in opposite directions. A powerful earthquake releases pressure built up from plates moving against each other.

As soon as the quake is over, movement begins again, but usually takes more than a year to build up.

When was the first typewriter invented? The first patent for a machine called a typewriter was issued to Henry Mill in 1714. Mill's typewriter wasn't too useful, however.

So several other people in Europe and the United States kept working on a typing machine.

Finally, about 1867, Christopher Latham Sholes of Milwaukee, along with Carlos Glidden and Samuel Soule, patented a more practical machine.