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 [=are from the distant past; are very out of date]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.
(..) Dialogue: Marked=..,Default,NTP,!Effect,This is light? Dialogue: Marked=..,Default,NTP,!Effect,Of course! Here it is! Dialogue: Marked=..,Default,NTP,!Effect,Nicholas Flamel is the only known\Nmaker of the Sorcerer's Stone. Dialogue: Marked=..,Default,NTP,!Effect,The what? (..)2001 Harry Potter and the Sorcerer's Stone
(..) Dialogue: Marked=..,Default,NTP,!Effect,...asphodel and wormwood make a sleeping potion so powerful\Nit is known as the Draught of the Living Dead. Dialogue: Marked=..,Default,NTP,!Effect,A bezoar is a stone taken from the stomach of a goat\Nand it will save you from most poisons (..)2001 Harry Potter and the Sorcerer's Stone