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Firefighting foam left after a fire in Pennsylvania. These foams often contain PFAS chemicals that can contaminate water supplies. Bastiaan Slabbers/NurPhoto via Getty Images

PFAS ‘forever chemicals’ are widespread and threaten human health – here’s a strategy for protecting the public

PFAS chemicals are toxic, widespread and persistent in the environment, and the federal government has been slow to regulate them. A scientist explains why evaluating them one by one isn’t working.

New technique for invisibility cloaking

The first working invisibility cloak, designed using topology optimisation technique, has masked a poker chip-sized disc…

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