As wildfires multiply, a new era of air pollution

From Quebec to British Columbia to Hawaii, North America is facing an extraordinary wildfire season—and regions both near and far have found themselves increasingly blighted by smoke exposure.

Cleaning water with 'smart rust' and magnets

Pouring flecks of rust into water usually makes it dirtier. But researchers have developed special iron oxide nanoparticles they call "smart rust" that actually makes it cleaner. Smart rust can attract many substances, including ...

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