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COLUMNS Field Notes • On Standby for the New Ark If spider monkeys are chosen to ride out the "demographic winter," here is what latter-day Noahs will have to know WILLIAM ALLEN
Anecdotal Evidence • Keeping Our Words As languages, like species, face mass extinction, linguists struggle to help Native Americans remember what they've been told for decades to forget BURKHARD BILGER
ESSAYS & COMMENT Cover Story • Demographic Discord Even as delegates arrive for the decennial UN conference in Cairo, biologists and economists cannot agree about population policy NATHAN KEYFITZ
FEATURES Power Plants Sorting out the frenzied cellular process that leads to the growth of leaves JOHN E. DALE
On Common Ground • Exotic Interiors Beneath the skin, life-forms too alien to imagine PHOTOGRAPHS BY ROSAMOND PURCELL TEXT BY STEPHEN JAY GOULD
What Kind of Love Is This? When memory fades, desire lingers on. Can nursing homes cope with their residents' sexuality? ATHENA H. MCLEAN
REVIEWS Women Who Run with Physicists Breaking into the men's club of physics takes love, grit, determination and a talent for blending in ANN K. FINKBEINER
Books in Brief • A World That Slipped Away PLUS: Evolution observed; residential shelters for the mentally ill LAURENCE A. MARSCHALL
DEPARTMENTS Initial Conditions • Editor's Notebook
Peer Review Letters from Readers
Working Hypotheses • Parachutes and Population
Quanta Exotic particles and inflationary cosmology; grabbing molecules, one at a time; flywheels that just keep on going; watching the brain play chess
Strange Matter Apex Tobacco: An Internal Memo ROZ CHAST
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