What is the name of the feel good chemical in our body?

What is direct sterilization? What is a material through which negatively charged particles flow easily? What it the Hardest known mineral is? What does the decay rate algorithm mean? Who discovered gold from the periodic table? Cell mediated immunity anatomy definition? Where does ann arbor faucet water come from? How many watts is the average refrigerator rated at? What affect liquid density? What voltage is required for a 3 pin plug to operate? What is the function of left main? When rocks exposed they start to be eroded does the cycle start again? What organ system do nose ears eyes and mouth belong? What happens to CO2 when yeast is fermented? What does osmosis bring in to the cell that helps wilted plant cell? What will decreasing a telescope's eyepiece focal length? Why is it misleading to draw the boundary between two lithospheric plates as a single line on a map? How long for hot liquids to return to room temp? What is the difference between a heterogeneous and homogeneous mixture? How many cc equal a tsp?