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BBC News - Science & Environment

1. Rotten egg gas around planet Uranus
   The planet Uranus has clouds made up of hydrogen sulphide, the gas that gives rotten eggs their unpleasant smell.
2. Environment prize goes to Flint water activist
   An activist who helped expose a water crisis in a US town has been awarded a prestigious environment prize.
3. Climate change: Michael Bloomberg pledges $4.5m for Paris deal
   New York City's ex-mayor pledges $4.5m to help cover the lapsed US contribution to the Paris accord.
4. 'Exploding ant' species found in South East Asia
   The newly discovered canopy-dwelling ants are nicknamed after their bizarre defensive behaviour.
5. Why I live in a plastic bottle castle
   The man building a four-storey castle out of recycled plastic bottles.