Authorities are trying to find the source of tainted food that made about 100 people sick on Colorado River tour boat trips through the Grand Canyon over the past month.

Adam Kramer, a public-health specialist for the National Park Service, says the gastrointestinal illness affected tourists on twelve seperate trips with five tour companies, all Utah-based

Scientists at the National Institutes of Health are infusing sodium nitrite into volunteers in hopes it can prove a cheap, but potent treatment for sickle cell anemia, heart attacks, brain aneurysms, even an illness that suffocates babies.

Those ailments have something in common: They hinge on problems with low oxygen, problems the government's research suggests nitrite can ease

Scientists at the National Institutes of Health are infusing sodium nitrite into volunteers in hopes that it can prove a cheap but potent treatment for sickle cell anemia, heart attacks, brain aneurysms, even an illness that suffocates babies.

Those ailments have something in common: They hinge on problems with low oxygen, problems the government's research suggests nitrite can ease, The Associated Press reports

Authorities ban 1,856 pounds of beef that were shipped to wholesalers in a half-dozen states under rules designed to protect consumers from mad cow disease

The beef included meat from a Canadian cow that inspectors in Canada determined was eligible for shipment to the United States. A Canadian audit two weeks later found, however that the cow was too old to be allowed entry to the U.S., The Associated Press reports

After two years, the border between Canada and the U.S. has been opened to cattle trade.

Concerns over mad cow disease caused the border to be closed until Canada's agriculture minister announced a truck carrying cattle was transported to the U.S