Energy is stored in the covalent bonds between phosphates
Water doesn't absorb heat as quickly as sand
Bones of snakes are very loosely fused together like in humans. Hence these bones can move individually allowing the snakes to be really flexible. The ribs of snakes do not join like those of humans but instead, have free ends and do not have a sternum.
What makes studying people difficult is that you are yourself. You will always be different from other humans, so studying them naturally takes you out of your comfort zone