ANSWER: DOPAMINE
EXPLANATION:
DOPAMINE works jointly as a hormone and neurotransmitter in the body. Dopamine’s role or effects in the body system ranges from high libido, anxiety, difficulty sleeping, increased energy, improved focus and learning ability etc.
However, Dopamine also makes us feel satisfied after food consumption, ensue happiness after stimulating drugs use (such as amphetamines).
It's also responsible for making high risk decisions which generates high risk activities (such as jumping out of a moving train).
Thus, Gregory have been using dopamine triggering addictive drugs, presumably with tradename of Intropin, Dopastat, or Revimine.
They can cause mud flow: in fact, in a famous volcano eruption in Chile in 1985 this is what caused the majority of the deaths .
Volcanic eruptions can also cause earthquakes, but very mild ones; the ones we hear about are usually caused by tectonic movement, not volcanic eruptions.
In the video clip "Iousa the movie" on the state of the economy, the greatest threat to America's future is 4) fiscal irresponsibility.
Because generally Americans don't really pay a lot of attention to such details, it may cause many bad things to happen to their economy. Even though at the moment, its economy is quite good, things may change for the worse in the future if something doesn't change.