https://www.interez.sk/na-sibiri-sa-po-130-tisic-rokoch-topi-permafrost-rucaju-sa-cesty-tvoria-giganticke-kratery/2a7d78f800000578-0-researchers_have-a-6_1436778574093/ byť smart je interez Sun, 06 Aug 2017 15:12:37 +0000 hourly 1