BAD™ reactors are reactors which feed upon, generate, cause, or otherwise interact with BAD™. BAD™ reactors are known to replicate pentationally, and are known to be bad. If one ever converses with a BAD™ reactor, one will find it to be wrong in all ways.
History
BAD™ reactors are thought to have been retroactively been caused by BAD™ reactors, to cause more bad. They are known to be the cause of IPv4's persistence, among other bad standards.