Ensuring the Longevity of Digital Documents
The digital medium is replacing paper in a dramatic record-keeping revolution. But such documents may be lost unless we act now
Volume 272, Issue 1
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Features
A Persuasive Experiment
Earth before Pangea
The North American continent ay be more nomadic than any of its inhabitants
Elastic Biomolecular Machines
Synthetic chains of amino acids, patterned after those in connective tissue, can transform heat and chemical energy into motion
The Oldest Old
People in their late nineties or older are often healthier and more robust than those 20 years younger. Traditional views of aging may need rethinking
Survival of the Fittest
Three who Thrive
The Birth and Death of Nova V1974 Cygni
The brightest nova in 17years answered many questions during its life and raised more in death
Egil's Bones
An Icelandic saga tells of a Viking who had unusual, menacing eatures, including a skull that could resist blows from an ax. He probably suered from an ailment called Paget's disease
Better than a Cure
The World Health Organization wants industry to step up its eorts to develop new vaccines. Can big business and a public health bureaucracy see eye to eye?
Born in the U.S.A.
Many ways to make a Vaccine
The Prion Diseases
Prions, once dismissed as an impossibility, have now gained wide recognition as extraordinary agents that cause anumber of infectious, genetic and spontaneous disorders