Asphalt is everywhere, but is it bad for our health?

If you piled all of Phoenix's pavement into one spot, it would be enough to cover San Francisco four times over. Roads, parking lots, and other paved surfaces blanket a lot of land—an estimated 40% of Arizona's capital city.

Cannabis and driving? Studies reveal big risks

Researchers at the Colorado School of Public Health (CSPH) are studying how cannabis use affects driving performance. Using a "video game-like" simulator, they measure how people drive before and after consuming cannabis.

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