Police siren

BETHALTO - A 30-year-old man was brought to the Bethalto Police Department by a friend Tuesday morning after he suffered a serious injury to his arm from

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St. Clair and Bibb county authorities are confirming there were roadblocks at several locations in their counties Friday and Saturday asking for blood and DNA samples. However, the samples were voluntary and motorists were paid for them as part of a study, they said.

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The Doppler Effect is another aspect of waves with many different applications, and it is also the reason for why the sound of a police siren changes. As a police car approaches its observer, the frequency of the sound waves increase, and then it decreases again when the car moves away. Therefore, the sound is received differently by the observer's ear drums, causing the change in sound. This phenomenon can be applied to a piece of technology also used by the police, called the radar gun.

You know that obesity and high blood pressure can raise your risk for a heart attack, but WebMD's slideshow illustrates some lesser known triggers that might surprise you.

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