Air-filled tyres were used on bicycles before they were used on motorcars.

More than 60 million people annually visit France, a country of 60 million people.

About a quarter of the world still drives on the left, and the countries that do are mostly old British colonies.

The usual thermal efficiency of reciprocal steam engine is 15%. That of steam turbine is over 40%.

Oar-powered ships were developed by the Sumerians in 3500 BC.

There are about a billion bicycles in the world, twice as many as motorcars.