"Lightbulb joke collection 44" joke

Q: How many Heisenbergs does it take to change a light bulb?
A: If you know how many, you can't know if they've done it yet.

Q: How many Heisenbergs does it take to change a light bulb?
A: If you want to know how many, you can observe them as they come in the door. But if not observed, they come in waves.

Q: How many Heisenbergs does it take to change a light bulb?
A: The probability that the light bulb will actually be changed in any time interval is independent of how long you've been waiting.

Q: How many scientists does it take to change a light bulb?
A: None. They use them as controls in double blind trials.

Q: How many company biotechnologists does it take to change a light bulb?
A: Four; one to write the proposal, one to design the bulb-changer, one to design the bulb-fetcher, and one to design the bulb.

Q: How many freelance biotechnologists does it take to change a light bulb?
A: One; he designs the bulb to crawl up the wall, unscrew the old one and screw itself in.

Q: How many jugglers does it take to change a light bulb?
A: One, but it takes at least three light bulbs.

Q: How many gorillas does it take to screw in a light bulb?
A: Only one, but it sure takes a lot of light bulbs!