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The Paralytic Plague

The virus that causes the symptoms of poliomyelitis has a subtle relationship with man. Not all of its hosts are sick, which explains some curious aspects of its behavior

By David Bodian

The Navigation of Bats

How do the tiny winged mammals so skillfully avoid obstacles in the dark? Some say that they possess radar, and this is surprisingly close to the truth

By Donald R. Griffin

The Food Problem

The hunger of two thirds of the people is a serious economic and political threat to the rest. A summary of the problem and an approach that may alleviate it

By Lord John Boyd-Orr

The Agora

It was the great public square of ancient Athens. In recent years it has been extensively excavated to reveal its plan and its relation to the good life of the Greek city-states

By Homer A. Thompson

Power from the Sun

While man steadily consumes his limited store of fossil fuels, a bounteous supply of energy is showered upon him by the sun. What are the fundamental means of tapping it?

By Eugene Ayres

Eye and Camera

The classical comparison of the two devices is still fruitful. Today it has gone beyond their optics into their basic physics and chemistry

By George Wald

Exploring the Ocean Floor

One of the last frontiers of the earth's solid surface has been made more accessible by new instruments built in Sweden and carried around the world by the Albatross

By Hans Pettersson

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