Although the Chinese couldn't tell anyone exactly what an earthquake measured on the Richter scale (since the Richter scale wasn't created until 1935), they did manage to invent the world's first earthquake detector -- a seismograph.
WHAT IS AN ALIBI? An alibi is any evidence showing that a citizen accused of a crime was somewhere other than at the scene of a crime when the crime occurred. While T.V. and movies often portray the alibi as a fraudulent and untruthful, in the real world, the alibi is a perfectly respectable legal defense.
Concussion, also known as minor head trauma or mild traumatic brain injury (mTBI) is the most common type of traumatic brain injury. It is typically defined as a head injury with a temporary loss of brain function. Symptoms include a variety of physical, cognitive, and emotional symptoms, which may not be recognized if subtle. A variety of signs accompany concussion including headache, feeling in a fog, and emotional changeability.