We're used to the idea of soldiers working in the dark or even via remote control.
But how about working in an cloud of invisibility that not only masks objects - but actual events?
Well, catch up. American scientists working for the Pentagon have published research which demonstrates how to hide history as it happens.
A team at Cornell University working with the Defense Advanced Research Projects Agency (Darpa) has published a report in the journal Nature demonstrating how to hide an event for 40 trillionths of a second.
The effect, described as "spatio-temporal cloaking", depends on the ability to slow the flow of light from events as they occur - making them impossible to observe.
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