Quoted: Internet search giant Google unveiled Chrome, a new piece of Web browser software on Tuesday. Danny Sullivan, editor-in-chief of SearchEngineLand.com, explains what Google's open-source browser can do, and why a search engine leader wants to get into the Web software market.

Quoted: The levees of New Orleans held fast against Hurricane Gustav but several more storms — including Hanna, Ike and Josephine — are now forming. Hurricane expert Ivor van Heerden discusses the levee reconstruction project and how New Orleans will fare during what is expected to be an active hurricane season.

Quoted: Officials in many states are concerned about the reliability of electronic voting and are now moving toward systems that can provide a voter-verified paper trail. Larry Norden, author of The Machinery of Democracy, discusses the latest advances in voting technology.

Quoted: A health research advocacy group recently sent a questionnaire to both campaigns asking for policy details on issues such as health care coverage, stem cell research, the Medicare prescription drug benefit, and funding for NIH, FDA and CDC. Mary Woolley, president of Research!America, talks about the candidates' responses.

Quoted: The GeoEye-1 satellite will be capable of making out details on Earth just 16 inches across. It will be the highest resolution satellite run by a private company; it's images will be marketed to a range of governments and private customers.

Quoted: Callers share their scientific triumphs from the summer months. Did you find a fossil? Outfit your house with solar power? Grow a prize-winning pumpkin? Tell us about it.

Quoted: Bioengineering researcher Michael Dickinson used superslow-motion video cameras to study how flies are so effective at avoiding swatters. He found that flies perform an elegant ballet with their legs — responding to threats in less than 1/10 of a second.

Quoted: The massive Large Hadron Collider at CERN is just a few weeks away from startup. The particle accelerator has passed several key performance tests, and is on track to send the first beam of particles through the ring of the accelerator on Sept. 10.

Quoted: State and local governments across the country are requiring a growing list of vaccinations for children entering school. Public health advocates say that the vaccines are well-tested and serve a vital role in preventing disease outbreaks, but some parents still have concerns.