Obligatory quote by Erdos: Suppose aliens invade the earth and threaten to obliterate it in a year&#x27;s time unless human beings can find the Ramsey number for red five and blue five. We could marshal the world&#x27;s best minds and fastest computers, and within a year we could probably calculate the value. If the aliens demanded the Ramsey number for red six and blue six, however, we would have no choice but to launch a preemptive attack