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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).
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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.
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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