Positron emission tomography (PET) is a test that uses a special type of camera and a tracer (radioactive chemical) to look at organs in the body. The tracer usually is a special form of a substance (such as glucose) that collects in cells that are using a lot of energy, such as cancer cells.
The Eleventh Amendment was ratified in 1798 in order to overrule the Supreme Courtâs decision that a South Carolina citizen could sue the state of Georgia for money damages.he Eleventh Amendment was ratified in 1798 in order to overrule the Supreme Courtâs decision that a South Carolina citizen could sue the state of Georgia for money damages.
The 21st Amendment Is Ratified. On December 5, 1933, the 21st Amendment to the U.S. Constitution was ratified. The 21st Amendment repealed the 18th Amendment, making alcohol once again legal. This was the first and only time in U.S. history that an Amendment has been repealed.