Britain cut German submarine cables Room 40 wireless

Britain’s cable cuts left Germany using wireless

When Britain entered World War I, it cut five undersea cables linking Germany with France, Spain, and the Azores, with connections onward to North America. Germany was left communicating by wireless, allowing Room 40 to listen in.

Misleading questions can alter memory

Human memory is reconstructive rather than a literal recording. When a question uses misleading wording, people may remember details that were not present. This effect is known as the misinformation effect.

A spinning mercury telescope mirror must always face upward

Spinning liquid mercury naturally forms the curved shape needed for a telescope mirror. Such mirrors can be far cheaper than large solid ones. But liquid cannot be tilted without spilling or changing shape, so the telescope must always look straight up.

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Britain cut German submarine cables Room 40 wireless

Britain’s cable cuts left Germany using wireless

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