To find a leak in your mattress, start by inflating it completely. Then apply a soapy sponge to the surface of the mattress and look for any areas where bubbles form and grow. This will indicate a possible leak. Alternatively, you can just listen to the sound of escaping air.
Cows don’t have upper front teeth.
They do have molars on top, in the back of their mouths, but where you’d expect upper incisors, cows, sheep, and goats have a thick layer of tissue called a dental pad. They use that with their bottom teeth to pull out grass.