There is a farmer who is having problems with his chickens. All of the sudden, they are all getting very sick and he doesn't know what is wrong with them. After trying all conventional means, he calls a biologist, a chemist, and a physicist to see if they can figure out what is wrong.

So the biologist looks at the chickens, examines them a bit, and says he has no clue what could be wrong with them. Then the chemist takes some tests and makes some measurements, but he can't come to any conclusions either. So the physicist tries. He stands there and looks at the chickens for a long time without touching them or anything.

Then all of the sudden he starts scribbling away in a notebook. Finally, after several gruesome calculations, he exclaims, 'I've got it! But it only works for spherical chickens in a vacuum.'

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A psychologist makes an experiment with a mathematician and a physicist. He puts a good-looking, naked woman in a bed in one corner of the room and the mathematician on a chair in another one, and tells him: 'I'll half the distance between you and the woman every five minutes, and you're not allowed to stand up.'

The mathematician runs away, yelling: 'in that case, I'll never get to this woman!'.

After that, the psychologist takes the physicist and tells him the plan. The physicist starts grinning.

The psychologist asks him: 'but you'll never get to the woman?', and the physicist tells him: 'sure, but for all practical things this is a good approximation.'

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Two mathematicians are in a restaurant, bemoaning the fact that the general public knows so little about mathematics. One is totally pessimistic, but the other thinks there's some hope.

Eventually the pessimist goes to the bathroom and while he's gone, the optimist brings over the waitress, who's a vacant-eyed blonde (oops! maybe this is a blonde joke). He hands her $10 and says, "When my friend comes back, I'll call you to the table, and I'll ask you a question. Just answer 'log x' and there's another $10 in it for you."

The friend returns, and the guy says, "You know, I think the general public DOES know more math than you think. I'll bet you $100 that the blonde waitress can integrate 1/x." Of course the other guy accepts, the waitress is brought over, and she's asked, "What is the integral of 1/x?"

She answers, "log x", then pauses, and adds, "plus an arbitrary constant."

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A biologist, a physicist, and a mathematician were sitting in a street cafe watching the crowd.

Across the street they saw a man and a woman entering a building. Ten minutes later they reappeared together with a third person.

"They have multiplied", said the biologist.
"Oh no, an error in measurement," the physicist sighed.
"If exactly one person enters the building now, it will be empty again," the mathematician concluded.