2007-04-18 Why Is The Sky Blue?

Nothing special happened today, so there's nothing better to do than tell one of my favorite jokes:

A physicist, a chemist, a beautiful girl and an old woman are sharing a cabin in a train. It is daylight, so nobody notices that the light bulb doesn't work, until suddenly everything gets pitch-black in a tunnel. You can hear the sound of a kiss and directly after that the sound of a slap in the face. At the end of the tunnel, the chemist is rubbing his cheek. This is what the four people are thinking:
Old woman: "Clearly, one of the two men tried to kiss the girl and so she slapped him."
Beautiful girl: "Looks like one of the men tried to kiss me and got hold of the old woman instead. She must have slapped him."
Chemist: "Surely, the physicist tried to kiss the girl and she thought it was me and slapped me."
Physicist: "In the next tunnel I'll do it again -- I'll kiss my hand and slap the chemist."

***

Talking about physicists: I've been reading an awfully interesting article answering the age old question "why is the sky blue?". It's written in a way that almost everybody can understand. In fact it's so easy that after having understood it, I feel kind of embarrassed that it took me so long and I couldn't figure it out for myself...