Wi-Fi signals can see through walls

(PhysOrg.com) -- Researchers at the University of Utah, USA, have discovered that variations in signal strengths in wireless networks can be used to "see" movements of people on the other side of walls or doors.

Storm Elsa moving on Florida after battering Cuba

As it moved toward Florida's Gulf Coast early Wednesday, Elsa weakened to a tropical storm, though it still barreled inland with gusty winds and heavy rains, the US National Hurricane Center said.

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