OVERCOMING his natural fear of heights, horticulturist Simon Goodenough, from London, England, found himself on the remote South Atlantic island of St. Helena, gingerly lowering himself on ropes down the face of a cliff. Eventually, he reached his goal and gently... 

ISAAC NEWTON, about 300 years ago, theorized how gravity works. He imagined a man throwing an object from the top of an unusually high mountain. If simply dropped, the object would fall, as would an apple, downward to the ground. If, however, it was thrown forward,... 

ONE of the most beautiful, ever-changing sights on earth is the sky. Its scope and grandeur simply stagger the imagination. The whole earth is enveloped with the sky’s endless majestic and colorful panorama. In the east a golden glow announces the dawn, while... 

WHEN anthropologists dig in the earth and find a triangular piece of sharp flint, they conclude that it must have been designed by someone to be the tip of an arrow. Such things designed for a purpose, scientists agree, could not be products of chance. When it... 

The humid tropical forest environment is fragile and extremely complex. The myriad life-forms depend on one another. For example, most plants depend on particular birds, insects, or animals for pollination and seed dispersal. In an intricate cycle of life, the...