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Humanity facing 'biggest challenge ever' with cyberwar threat in the next 20 years
scientist has suggested.While much of the world's focus is on the Covid pandemic and the sheer scale of its impact over the last year, attention may have been diverted from other earthly dangers. The fascinating theory was shared by Martin Rees, the UK's Astronomer Royal, during a talk with American astrophysicist Frederick Lamb, reports EarthSky.