Aliens are out there but they are dumb

World reknown British theoretical physicist Stephen Hawkings says that life in other parts of the universe must exist but they are probably dumber than us. From Daily Mail:

During his speech at George Washington University, Professor Hawking speculated on the reasons why mankind has failed to detect any signs of alien life.

He offered three possibilities: that life of any kind is very rare in the universe; that simple life forms are common, but intelligent life rare; or that intelligent life tends to destroy itself quickly.

"Personally, I favour the second possibility - that primitive life is relatively common, but that intelligent life is very rare," he said.

"Some would say it has yet to occur on Earth."