Each is lined with tissue called the mucosa, which secretes mucus continuously along hairy cells called cilia and out a tiny passageway called an ostium, through which the mucus drains into the nasal cavity and down the back of the throat, where it is swallowed (unless you blow your nose).

FORBES: Balloon Therapy

Cavity wall insulation slows down the rate at which warm air escapes your property, keeping each room of your house warm even when it is bitterly cold outside.

FORBES: How To Winterize And Heat Your Home For Less

Dr Cirac and Dr Romero-Isart therefore propose putting the virus inside a microscopic cavity and cooling it down to its state of lowest energy (ground state, in physics parlance) using a piece of apparatus known as a laser trap.

ECONOMIST: An old thought experiment may soon be realised