Technology
Bluetooth may not work well enough to trace coronavirus contacts
An experiment reveals how difficult it is to use Bluetooth on phones to determine if people have been in close enough contact to spread the coronavirus
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An experiment reveals how difficult it is to use Bluetooth on phones to determine if people have been in close enough contact to spread the coronavirus
The US Navy is researching how to use lasers to form plasma into 2D or 3D infrared images of aeroplanes that can distract heat-seeking missiles