The idea was to “unite all nations by the enlightening power of physics”. But with eight months to go, Max Lippitsch's plans have succeeded only in dividing his colleagues. Lippitsch, a physicist at ...

This light activated relay circuit presented here uses the 555 timer IC and a light dependent resistor or LDR to form a light sensitive relay in an intruder alarm system or for switching on a lamp at ...

Physicists and Albert Einstein buffs began flipping light switches and dialing phones Monday night in an attempt at a worldwide relay of lights to commemorate the 50th anniversary of Einstein’s death.