Heart attacks can be difficult to diagnose. But a new test ? using just a small saliva sample ? may provide a quick ?yes-no? answer.

Imagine talking on the phone, without talking.? Sound impossible?? Listen to this.

A student contest to create the best eco-friendly car ends with a road trip arriving in D.C. on Wednesday.? Randy Atkins caught up with the team from Virginia Tech.

Many diabetics need frequent injections of insulin, which can't be taken orally since it's destroyed by stomach juices.? A newly engineered capsule may change that.

Some are saying last month's earthquake in Illinois should serve as a wake-up call, because the next one could affect the whole country.

Researchers say bacteria can be used clean polluted water and could even generate electricity doing it.

Last week, we told you that space-based radar has revealed a massive ancient lake under the parched sands of Africa?s water-starved Darfur region.

The 5-year-old civil war in Darfur is partly a conflict over scarce water. Images from satellites and the space shuttle are now leading the way to underground water, and hope.

Wireless technology may soon enter your body in prescription drugs, telling you if you took too much, or reminding you when you're due for another dose.

A Rockville company is selling a new device that samples air and harnesses biological speed to spot dangerous pathogens -- like anthrax -- in minutes. ?