Stephen Hawking
If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans.
More quotes and aphorisms
Don't be shameless, Mr Blair. Don't be immoral...Sometimes life hits you in the head with a brick...Act your age...Like all pure creatures, cats are practical...Christ died to save this lost world...One part of wisdom is knowing what you don't need...