Why you should not put a cat in the microwave oven

The heating effect of the microwaves comes from the resonance frequency. The wavelengths of the microwave is close to the wavelength, how the water molecules vibrate. And the waves pass small energy packets to the water molecules, speeding up their movement, and this produces heat.

So why is this dangerous for the cat? Read more if you want to know.

(image source: http://www.gifbin.com/981675)

The ultimate perpetuum mobile

This joke might reveal what the contradiction of perpetuum mobile is.

The rabbi is asked one day:

- Is it true that if I let fall a slice of bread with butter on the top, it will fall on the side with the butter?

- Yes, answers the rabbi.

- And is it true that if a cat is falling it always falls on the feet?

- Yes.

- So what happens if I let fall a cat standing on the top of the butter bread?

But really, what happens? Let's suppose that both statements are true. Both items should fall on the side where they are glued together. So the answer is simple: it should never fall, and keep flying. And we can say that this is the greatest discovery of all times.