euthanasia: the act of killing someone painlessly (especially someone suffering from an incurable illness)
psychological feature: a feature of the mental life of a living organism
coriolis effect: (physics) an effect whereby a body moving in a rotating frame of reference experiences the Coriolis force acting perpendicular to the direction of motion and to the axis of rotation; on Earth the Coriolis effect deflects moving bodies to the right in the northern hemisphere and to the left in the southern hemisphere