Scientific American Magazine

The fastest, most reliable way to detect an artificial satellite and initially to determine its orbit is by radio. A far-flung system called Minitrack has been established for this purpose

A grasshopper can leap 20 times its body length. The physiology of this remarkable performance is studied both for its intrinsic interest and for its usefulness in improving control of the insect

At low altitudes the air streaming past a flying object behaves as a true fluid, but at altitudes above 40 miles the object is struck by individual atoms and molecules

This rule of modern physics, which states that events at the atomic level cannot be observed with certainty, helps resolve the paradox that particles sometimes behave like waves and waves like particles

They are among the most useful of all drugs. In small doses they act as sedatives; in larger doses they induce sleep; in still larger doses they are able to produce deep anesthesia

In which the effect of a human mutation that causes a disease of the blood is traced to a change in one of the 300 amino acid units that make up the structure of the protein hemoglobin

A pigeon can be trained to peck when a light of a certain wavelength is flashed. It will also peck at lights of other wavelengths, but at a rate which declines in proportion to the difference in wavelength

The whale feeds its enormous bulk by sifting out tons of tiny crustaceans from the ocean every day. More studies of whales and what they feed on may help solve the human food problem