Chemicals from our phone and TV screens are accumulating in the brains of endangered dolphins and porpoises. New research shows these "liquid crystal monomers" from e-waste can cross the blood-brain barrier and may disrupt DNA repair, highlighting the growing impact of electronics on marine life.

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As critical talks over Iran’s nuclear programme entered their second round on Thursday night, and a vast US military buildup continued in the Middle East, the Trump administration warned of drastic consequences if Iranian negotiators failed to make significant concessions.

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"We chose a threshold that requires a few searches within a short period of time, while still erring on the side of caution," Instagram's blog post explains. "While that means we may sometimes notify parents when there may not be real cause for concern, we feel — and experts agree — that this is the right starting point, and we’ll continue to monitor and listen to feedback to make sure we’re in the right place."

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She added: "If you are collecting your food in a caddy, you really get to see firsthand what you're throwing away. I think that can really prompt some rethinking."