Marihuana
There is considerable evidence that the drug a comparatively mild intoxicant. Its current notoriety raises interesting questions about the motivation of those who use it and those who seek to punish them...
Features
New Methods for Approaching Absolute Zero
Low-temperature physicists have recently devised three different experimental procedures capable of lowering the temperature range accessible for research to within millidegrees of absolute zero...
The Rise and Fall of Arabia Felix
The Semitic kingdoms of southern Arabia waxed rich during the first millennium B.C. by controlling the trade in frankincense and myrrh. Why they waned a few centuries later is a question still under study...
The Mechanism of Photosynthesis
Light of two wavelengths is required to activate two photochemical systems. Together they provide the electrons, protons and enery-rich molecules needed to convert carbon dioxide and water into food...
Dermatoglyphics
Fingerprints and the similar ridges on the palm of the hand and the sole of the foot have more uses than identification: they are also of value in anthropology, medicine and genetics
Measuring Earth Strains by Laser
Large interferometers operating with laser beams make it possible to detect tiny distortions of the earth's crust with unprecedented sensitivity. One of these laser strain meters is 1,020 meters long...
How an Instinct is Learned
A study of the feeding behavior of sea gull chicks indicates that an instinct is not fully developed at birth. Its normal development is strongly affected by the chick's experience
The Peculiar Distribution of First Digits
In numbers that appear in tables of constants, lists of street addresses and similar tabulations the first digit of the number is 1 almost three times more often than one would expect. ..
Departments
50 and 100 Years Ago: December 1969
Science and the Citizen: December 1969
- Letters
Letters to the Editors, December 1969
- Recommended
Books
- Mathematical Recreation
Mathematical Games
- Amateur Scientist
The Amateur Scientist
- Departments
The Authors
Annual Index
Bibliography
