‘Toothpick grooves’ in ancient fossil human teeth may not be from toothpicks after all

For decades, small grooves on ancient human teeth were thought to be evidence of deliberate tool use – people cleaning their teeth with sticks or fibres, or easing gum pain with makeshift “toothpicks” ...
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'The metal detector has gone off': Perseverance rover's find is a shiny new clue in the search for life on Mars

"This is the moment where the metal detector has gone off and you've dug up something shiny. You still need to find out ...