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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The 10% leeway is being built in to reflect that some patients may not be able to make a same-day appointment or may call too late in the day to be realistically given one.