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  1. Health & Medicine

    Boning up on calcium shouldn’t be sporadic

    The gains in bone health can quickly disappear when people stop taking extra calcium.

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  2. 19119

    Regarding the discovery of the dinosaur heart with the single aorta, your readers should note that this morphology is more likely to be related to high blood pressure than metabolic rate per se. The typical reptilian heart, with its incompletely divided ventricle and double aorta, is quite functional at separating oxygenated and deoxygenated blood. The […]

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  3. Paleontology

    Telltale Dino Heart Hints at Warm Blood

    A recently discovered fossil dinosaur heart is more like the heart of birds and mammals than that of crocodiles, providing further evidence that dinosaurs may have been warm-blooded.

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  4. Chemistry

    Hot Spuds: Golden path to acrylamide in food

    The browning reaction that imparts flavor to french fries and breads also creates acrylamide, an animal carcinogen.

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  5. Materials Science

    Molecular Separations: New artificial sieve traps molecules

    Researchers have created a metal-laced organic solid that acts as a sieve with nanosize pores for capturing molecules.

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  6. Making Mice Mellow: Rodents yield clues to improved anxiety drugs

    Mice bred to lack a gene for a certain enzyme exhibit reduced anxiety and greater curiosity in stressful laboratory tasks, suggesting a possible new avenue of research into anti-anxiety medications.

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  7. Humans

    From the April 19, 1930, issue

    TRAVEL TO THE MOON BY THE YEAR 2050 By the year 2050, Earth-dwellers will probably be able to travel to the moon and to communicate with their terrestrial home by telephoning over a beam of light. They will get there by traveling in a rocket ship at a speed of some 50,000 miles an hour, […]

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  8. Tech

    Engineering Top 20

    Airplanes, telephones, refrigerators, and spacecraft are among the life-changing technological accomplishments highlighted at the National Academy of Engineering’s Greatest Engineering Achievements of the 20th Century Web site. A variety of illustrations, a brief history, and a timeline of important landmarks accompany each entry. Go to: http://www.greatachievements.org/

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  9. 19094

    The scientists in this article may want to adapt their solar concentrator for a more prosaic use: cooking. In the early 1970s, I was involved in a project to build a self-sufficient dwelling that drew solely on the wind and sun for its power. We looked into using fiber optics to transmit solar energy to […]

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  10. Tech

    Solar Surgery: Sunlight acts like laser

    By channeling sunlight down a fiber optic cable, scientists have produced laserlike beams that can burn tumors off major organs.

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  11. Physics

    Prize honors physicist with conscience

    Physicist-author Freeman J. Dyson received the Templeton prize for originality in advancing religious understanding.

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  12. Physics

    Four ions mingle in quantum chorus

    A new way to produce mysterious quantum correlations among particles ups the record to four particles linked, or entangled, and opens the door to correlating many more particles on cue, a prerequisite for making quantum computers.

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