Parkinson's disease. It's caused by low dopamine levels and is know for causing shakiness in the hands.
Paying attention to what he's hearing
The answer is either denial. it covers up the sadness tricking yourself into thinking you are not sad.
To actually control the color of their skin, cephalopods Use tiny organs in their skin called chromatophores. Each tiny chromatophores is basically a sac filled with pigment, minute muscles tug on the sac, spreading it wide and exposing the colored pigment to any light hitting the skin.
I think the answer is low fat milk