And when Dr Anderson injected the modified vesicles into mice and then shone ultraviolet light of a wavelength that can pass through flesh at some of them, he found the tactic worked.

ECONOMIST: Drug delivery

In 1998 chipmakers took up so-called deep ultraviolet light, which has a wavelength of 0.248 microns.

FORBES: Trick of the Light

In the late 1980s they turned to ultraviolet light, which has a shorter wavelength (0.435 microns and smaller).

FORBES: Trick of the Light

In the late 1980s they turned to ultraviolet light, which has a shorter wavelength (0.435 microns and even smaller).

FORBES: Trick Of The Light

Now they have something that works like a flatbed document scanner, with a scanning head containing either six or 12 light-emitting diodes, each emitting light of a specific wavelength between 350 nanometres (ultraviolet) and 800 nanometres (infra-red).

ECONOMIST: Monitor