There is an old tale of greek philosophers debating how many teeth a horse has. - "They have a small mouth that cannot fit very many teeth - they must have les

There is an old tale of greek philosophers debating how many teeth a horse has. - "They have a small mouth that cannot fit very many teeth - they must have less than 20." - "They chew a lot so must have big strong teeth - big teeth take up more room so I agree they must not have very many." - "I disagree, they only eat grass their teeth do not not need to be strong. But they need very many teeth to chew it effectively!" and on and on. Finally one of them opens a horse's mouth and counts...