LIMA (Reuters) - The fossil of a giant whale called Leviathan for having teeth bigger than a grown man's forearms has been found in Peru by palaeontologists who on Thursday said it may have been the ...

What does this mean? First, grooves that resemble "toothpick" marks don't necessarily prove tool use. Natural chewing, abrasive foods, or even swallowed grit can produce similar patterns. In some ...

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” ...