Humanoid's health won't TakeDamage on Touch?

I created a Tool with only a brick and a script in it. I created a humanoid with only a part named Head in it. When the Tool touches the Humanoid part, the humanoid should lose 10 health. But nothing happens.

The script:

script.Parent.Handle.Touched:connect(function(part)
	part.Parent:FindFirstChild("Humanoid")
	if found then
		Humanoid:TakeDamage(10)
	end
end)

What's wrong?

I'm not sure what you mean by if found then, because that wouldn't work. Also you didn't define Humanoid. You could simply do it like this:

script.Parent.Handle.Touched:connect(function(hit)
	local hum = hit.Parent:FindFirstChild("Humanoid")
	if hum ~= nil then
		hum:TakeDamage(10)
	end
end)