William Mullen

After waiting for a warm, summery day, biologist Doug Taron and a handful of colleagues fanned out through a thousand acres of restored prairie this month, stroking plants with delicate...

As he studied photos of a Chinese fossil sent to him by a private collector, University of Chicago paleontologist Paul Sereno felt his skepticism giving way to excitement at seeing...

With more than half of the state's counties reporting confirmed cases of the so-called swine flu, Illinois health officials reported Thursday that the state should get an initial delivery of...

Every year, top U.S. health officials send out widely publicized reminders to get vaccinated against seasonal flu. And every year, more than 60 percent of the public looks the other...

As the swine flu spreads across the Chicago area this fall, doctors at Elmhurst Clinic plan to quickly notify pregnant women, children and other high-risk patients about the need for...

Weak and near death when he was born at Brookfield Zoo, a baby antelope named Chad now carries big hopes on his little shoulders that he will grow up to...

Turns out it takes some digital wizardry to replace a broken heart that people used to walk all over. Technicians at the Museum of Science and Industry were laboring Tuesday...

When the Lincoln Park Zoo decided to convert a concrete- and steel-lined pond into the heart of a showcase preserve, it had to craft a construction plan around something unusual:...

About 260 million years ago, a scared and hungry animal, out-competed for food by larger beasts and chased by predators, left the ground and climbed a tree. The creature was...