Looking up into the night sky is looking into infinity — distance is incomprehensible and therefore meaningless - Douglas Adams

"The mice were furious."
[...]
"Oh yes," said the old man mildly.
"Yes well so I expect were the dogs and cats and duckbilled platypuses, but..."
"Ah, but they hadn't paid for it you see, had they?"
"Look," said Arthur, "would it save you a lot of time if I just gave up and went mad now?"
[...]
"Earthman, the planet you lived on was commissioned, paid for, and run by mice. It was destroyed five minutes before the completion of the purpose for which it was built, and we've got to build another one."
Only one word registered with Arthur.
"Mice?" he said.
"Indeed Earthman."
"Look, sorry - are we talking about the little white furry things with the cheese fixation and women standing on tables screaming in early sixties sit coms?"
Slartibartfast coughed politely.
"[...] These creatures you call mice, you see, they are not quite as they appear. They are merely the protrusion into our dimension of vast hyperintelligent pandimensional beings. The whole business with the cheese and the squeaking is just a front."
The old man paused, and with a sympathetic frown continued.
"They've been experimenting on you, I'm afraid."

Stomp stomp.
Whirr.
Pleased to be of service.
Shut up.
Thank you.
Stomp stomp stomp stomp stomp.
Whirr.
Thank you for making a simple door very happy.
Hope your diodes rot.
Thank you. Have a nice day.
Stomp stomp stomp stomp.
Whirr.
It is my pleasure to open for you...
Zark off.
...and my satisfaction to close again with the knowledge of a job well done.
I said zark off.
Thank you for listening to this message.

We don't have to save the world. The world is big enough to look after itself. What we have to be concerned about is whether or not the world we live in will be capable of sustaining us in it.