News
- Health & Medicine
Did colonization spread ulcers?
A comparison of strains of Helicobacter pylori, the bacterium that causes ulcers, suggests that colonists brought it to the New World.
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Biodiversity may lessen Lyme disease
A survey of Lyme disease rates suggests that a greater diversity of small mammals and lizards may help keep the rates down.
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Old lemming puzzle gets new answer
A novel analysis suggests food supply variations as the answer to the decades-old puzzle of what makes lemming populations boom and bust.
- Physics
Stretched matter goes to unusual extremes
Researchers have discovered that several unusual forms of matter with extremely high or low densities can expand laterally in one direction and contract in another when extended.
