World of Knowledge (Australia) - - Nature -

With tem­per­a­tures of up to 50ºc and 90-100% hu­mid­ity, it’s no won­der ge­ol­o­gists have de­scribed the Naica caves as “the most un­wel­com­ing re­search lab­o­ra­tory in the world.” Re­searchers need to wear spe­cial pro­tec­tive ice­suits – and even then they can only spend a max­i­mum of 50 min­utes in this vast crys­tal palace.

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