Gases in Earth's atmosphere absorb about 90 percent of this heat and radiate it back to the surface, which is warmed to a life-supporting average of 59 F (15 C). This very helpful process is called the greenhouse effect.
Anything that interrupts the normal connections between nerve cells in the brain can cause a seizure; this includes a high fever, low blood sugar, alcohol or drug withdrawal, or a brain concussion. Under these circumstances, anyone can have one or more seizures.
A seizure occurs when there is abnormal electrical activity in the brain. Seizures are also known as convulsions â but not all seizures produce convulsive behavior â that is uncontrollable muscle contractions. Absence seizures, for example, involve brief periods of staring. With atonic seizures, there is a loss of muscular tone or strength.