Is the Brain's Mind a Computer Program?
No. A program merely manipulates symbols, whereas a brain attaches meaning to them
Could a Machine Think?
Classical AI is unlikely to yield conscious machines; systems that mimic the brain might
Antisense RNA and DNA
Molecules that bind with specific messenger RNA's can selectively turn off genes. Eventually certain diseases may be treated with them; today antisense molecules are valuable research tools...
What Drives Glacial Cycles?
Massive reorganizations of the ocean-atmosphere system, the authors argue, are the key events that link cyclic changes in the earth's orbit to the advance and retreat of ice sheets
The Handedness of the Universe
From atoms to human beings, nature is asymmetric with respect to chirality, or left- and right-handedness. Clues are beginning to emerge that connect chirality on different levels
Stress in the Wild
Studies of free-ranging baboons in an African reserve are helping to explain why human beings can differ in their vulnerability to stress-related diseases
Two or more atoms-stripped of their outer electrons, trapped by electromagnetic fields and cooled to temperatures near absolute zeroarray themselves in structures that behave like both liquids and solids...
The Cosmic Background Explorer
NASA's cosmological satellite will observe a radiative relic of the big bang. The resulting wealth of data will be scoured for clues to the evolution of structure in the universe
50 and 100 Years Ago: January 1990
Loud and Clear
The Redshift Blues
On to the Past
A Grave Tale
See Spot See Blue
Sleep of the Guilty
Letters to the Editors, January 1990
Books, January 1990
Claude E. Shannon
- Amateur Scientist
The Amateur Scientist, January 1990
The Analytical Economist: Tweaking the Aggregates
Computer Recreations, January 1990
Essay: Ecological Diplomacy: an Agenda for 1990