His political ideas are from 'the Stone Age'. [=are from the distant past; are very out of date]
Their lawyer said that he would 'leave no stone unturned' in trying to find more evidence.
The researchers 'left no stone unturned' in their search for the original documents.
(..) Thank you. Hey. How did you get back? Well, after a few failed experiments... I hit upon a combination of bones, stone and yak fat... and constructed a rudimentary WABAC. You know what they say... "If at first you don't succeed, Troy, Troy again." (..)2014 Mr. Peabody & Sherman