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When the synthetic compound was force-fed to rats at doses of 1 gram per kilogram of body weight for two years, the animals developed kidney cancer and other forms of renal disease.

Workers have planted 285,000 trees to mitigate its significant environmental impact - offsetting more than seven million kilograms of CO2 a year - in a country that declared a climate emergency six years ago.

One is that 60 kilograms, or about 132 pounds, isn’t the average weight of American adults.

But both King Charles III and Elizabeth II wore the Imperial State Crown – which weights just more than a kilogram – as they left Westminster Abbey.

With a single kilogram of uranium yielding some 20,000 times as much energy as a kilogram of coal, it seemed like the future.