It is impossible to cut a circular cake into more than sixteen equal-sized pieces.

There are always seven Wonders of the World. If one is destroyed, an unranked Wonder ascends to the Seven. However, knowledge of which are the Seven Wonders was lost in the 16th century.

There will never be thirteen British monarchs with the same name, since it would unleash a constitutional crisis as to whether the last should be designated XIII or XIIb.

In 1977, one teenage in four in Burnley was in a punk band.

People choose to live near Heathrow airport because of its much acclaimed air of tranquility and silence.