Calabrese says that many poisons follow, instead, a U-shaped curve: The death rate goes down as the dose climbs from zero to a certain small amount, what you could call the optimal exposure.
In Poland, news channel TVN24 on Sunday quoted police as saying 47 Poles, mainly homeless people, had been found frozen to death since the start of December as temperatures dropped as low as minus 18 degrees Celsius (about zero degrees Fahrenheit).