@Lustig Andrei,
Set's link is a hyperlink. It explains it there.
I have always wondered why it's "good" too. I imagine the explanation would be there if one googled it. This thread, however, is here for nonsensical suggestions, not sober truth.
When I was a kid I could never understand how jesus was an adult when he was crucified, but had clearly only lived a few of months. I used to sing happy birthday to him on christmas morning, too.