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Stacks of rocks called cairns have long been used for navigation and decoration, but scientists are now asking hikers to stop making them. Learn how simply moving rocks can be hugely destructive (even if you put them back) in this episode of BrainStuff. Learn more about your ad-choices at https://news.iheart.com/podcast-advertisers

https://www.listennotes.com/e/cfbe27ea8ff748139c672594645ebbd0/

https://www.listennotes.com/e/1de414fa2875480bac5d401b7e75aaee/