Opinion: Seven wonders
Whenever the human race considers matters of great importance the number seven seems to regularly crop up. Thus we have the Seven Deadly Sins, and the Seven Wonders of the World. Taking a wild stab in the dark, we're guessing the seven days of the week have something to do with our fascination for this humble prime number. Then again, were we being faithful to our various faiths, we should be looking at six of everything, and then having a day off to get over it. But nobody would be interested in only six sins or just six wonders.