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The search for ways to prevent or treat Alzheimer's disease has been stymied in part by difficulties in reliably delivering therapeutics into the brain to prevent proteins there from depositing fibrous plaques that damage synapses and ultimately wreck one's cognitive abilities. Researchers have experimented with antibodies, peptides and even nanoparticles to find some way of effectively preventing plaque formation but these efforts have yet to yield an anti-Alzheimer's drug.

A jumping cockroach.

Dear EarthTalk : What is “tar sands oil” and what is the controversy over possibly building a pipeline for it from Canada into the United States?-- Bill Berkley, Omaha, Neb.

Today we saw land for the first time in days! Everyone was on deck together, untying the lines, taking photos and waving to the crew aboard a container ship that was docked in the marina. Stepping on land was wonderful, although I still feel like I’m swaying back and forth.

To what degree these and other differences originate in biology must be determined by research, not fatwa.

Editor's Note: The following blog post first appeared May 19 on the World Science Festival's Web site. Most people look for the key to postponing old age in mega-antioxidant-loaded juices, extreme exercise regimens, or expensive skin creams

Editor's note: This editorial was written and published in 1911. Although our editors of a century ago pondered some lofty aspirations for the orderly future of humans, it was only three decades later that the brutal reality of a Nazi social order suffused with a eugenicist ideal brought home the practical shortcomings of the philosophy. The Science of Breeding Better Men [More]

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Key concepts Water cycle [More]

TOKYO, May 25 (Reuters) - Japanese engineers are trying togain control of the Fukushima Daiichi nuclear power plant, 240 [More]

Psychopaths can't connect emotionally. Researchers have thought that trait may be connected with an outsized drive for reward and an inability to register fearful expressions in others’ faces

By Richard A. [More]

This year has already been the most successful breeding season to date for endangered North Island brown kiwis ( Apteryx mantelli ) at New Zealand's Pukaha Mount Bruce national wildlife center , and now the rangers who manage the program have an extra reason to celebrate: the May 1 birth of an extremely rare all-white kiwi . [More]

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By Zach Howard BUCKLAND, Mass (Reuters) - White nose syndrome, a devastating disease that has killed more than one million bats in the Northeast, has been found in Maine, the last New England state to discover it, wildlife officials said on Tuesday. [More]