The Russian physiologist Ivan Petrovich Pavlov, discoverer of the conditioned reflex, so trained his dog that he had only to ring a bell to make its mouth water. The governments of Europe hope to make their citizens' flight to safety just as automatic when the air-raid sirens wail.
>After last week's air-raid tests German officials could boast that it takes 4,000,000 Berliners just one minute to clear the streets and scurry into air-raid shelters. A year ago the record was two minutes. Germany claims to have a peerless Air Force. But there...
To continue reading:
or
Log-In
