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Ask mr brain...all will be explained

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Why you can trust SCMP

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.

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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.

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

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