Ultrasound, or ultrasonic waves, are acoustic pressure waves that travel at frequencies of over 20 kilohertz (20,000 cycles ...

Ozone is a strong oxidising agent that can cause respiratory irritation and respiratory diseases in humans and animals. The ozone layer in the stratosphere protects living organisms on Earth from ...

We spoke to officials at the Cedar Rapids facility and Coralville's Wastewater Treatment Plant to find out how these plants ...