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

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

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?

Many ways to make a Vaccine

Born in the U.S.A.