Many school children in the United States memorize President Abraham Lincoln's Gettysburg Address, considered one of history's most brilliant speeches and a model of brevity and persuasive rhetoric.

But according to two medical researchers at University of Texas Medical Branch at Galveston, most historians have failed to recognize that when Lincoln delivered it on Nov. 19, 1863, he was in the early stages of a life-threatening illness — a serious form of smallpox. Their report appears in the current issue of Journal of Medical Biography, a scholarly quarterly published by the Royal Society of Medicine Press in London (www.rsmpress.co.uk/jmb.htm).

Tomatoes might be nutritious and tasty, but don’t count on them to prevent prostate cancer. In the May issue of Cancer Epidemiology, Biomarkers & Prevention, researchers based at the National Cancer Institute and Fred Hutchinson Cancer Research Center report that lycopene, an antioxidant predominately found in tomatoes, does not effectively prevent prostate cancer. In fact, the researchers noted an association between beta-carotene, an antioxidant related to lycopene, and an increased risk for aggressive prostate cancer.

One of the world’s largest and least studied freshwater turtles has been found in Cambodia’s Mekong River, raising hopes that the threatened species can be saved from extinction.

Scientists from Conservation International (CI), World Wildlife Fund (WWF), the Cambodian Fisheries Administration, and the Cambodian Turtle Conservation Team captured and released an 11-kilogram (24.2-pound) female Cantor’s giant softshell turtle (Pelochelys cantorii) during a survey in March.

Despite the fact that they both infect the liver, the hepatitis A and hepatitis C viruses actually have very little in common. The two are far apart genetically, are transmitted differently, and produce very different diseases.

Hepatitis A spreads through the consumption of fecal particles from an infected person (in pollution-contaminated food or water, for example), but hepatitis C is generally transmitted only by direct contact with infected blood.

Forecasters will test a new technique this summer that provides a detailed 3-D view of an approaching hurricane every six minutes and allows them to determine whether the storm is gathering strength as it nears land. The technique, developed by researchers at the National Center for Atmospheric Research (NCAR) and the Naval Research Laboratory (NRL), relies on the existing network of Doppler radars along the Southeast coast to closely monitor hurricane winds.

New Danish research has examined the mechanisms behind latent cell memory, which can come to life and cause previously non-existent capacities suddenly to appear. Special yeast cells for example, can abruptly change from being of a single sex to hermaphrodite.

Researchers from the Niels Bohr Institute at the University of Copenhagen have used mathematical models and computer simulations to examine fundamental mechanisms of cell memory.