The greenhouse effect refers to the change in the thermal equilibrium temperature of a planet or moon by the presence of an atmosphere containing gas that absorbs and emits infrared radiation  Anthropogenic global warming (AGW), a recent warming of the Earth’s lower atmosphere as evidenced by the global mean temperature variance trend, is believed […]

  The beginning of the AIDS outbreak was a subtle shift in the genetic material of a virus which allowed the virus to become zoonotic, meaning that it could be transferred from animals to people. Over a period of time which probably lasted for decades, the virus was repeatedly transmitted from primates in Africa to […]