Though there is no reason to use Dr Knight's invention to replace existing optical fibres, it could, by varying the spacing of the air-filled tubes, make a handy filter allowing selected wavelengths (and the messages they carry) to enter or leave the waveguide while the others are contained.

ECONOMIST: New-age crystals

Other features: it cycles air through a HEPA filter, employs six Dyson-designed silencers to keep it quiet and its made with stainless steel.

FORBES: Billionaire Inventor James Dyson Announces Faucet With Attached Hand Dryer