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This is the only way to order one of the popular solo loop straps with your Apple Watch, as those fixed-length straps are only sold through Apple.

The new pressure sensor, called a fixed-length optical cavity, compares the speed of a laser travelling through a gas-filled cavity with that of an identical beam in a vacuum.

The concept of fixed-length hours, however, did not originate until the Hellenistic period, when Greek astronomers began using such a system for their theoretical calculations.

These fixed-length strings of characters cannot be rewound to reveal what characters gave rise to them.

Both cameras are fixed-length; zoom motors may be common in even the cheapest point-and-shoot digital cameras, but in a spacecraft they would have added extra fuel-guzzling mass.