Standard headlights barely cover the length of a football field, so that at 85kph, the most distant point visible is less than six seconds away.

ECONOMIST: When crashing is not an option

How many cranes are visible from a given point.

BBC: The popcorn route to recovery

Keynesians always point to the visible benefit to the secretary.

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Because the early universe is believed to have undergone a period of rapid inflation, features that were Planck-scale may have been magnified to the point where they are visible as blips in the cosmic microwave background, an electromagnetic echo of the Big Bang.

ECONOMIST: Planck-scale physics

Indeed, some at the meeting argued that if aliens were to use an astronomical phenomenon called gravitational lensing (in which the gravitational field of the sun bends and amplifies radio waves and light from Earth), human signals could be amplified to the point where even the light from cities would be visible.

ECONOMIST: An argument over whether to send messages to aliens

Unlike traditional laparoscopy, single port keyhole surgery requires just one point of entry rather than multiple, and often no scar is left visible at all.

BBC: Ninewells Hospital to use new keyhole surgery technique

The point was to understand what causes species to disappear, but the species themselves were not visible in her models.

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