ISBN-13: 9780228102328 / Angielski / Miękka / 2019 / 64 str.
ISBN-13: 9780228102328 / Angielski / Miękka / 2019 / 64 str.
A science writer explains what is cool about drool - its role in food digestion and dental hygiene and the secret properties of spit in the animal kingdom.