in a short concise sentence, why should who ever finds a Bitcoin block also find a namecoin.. ?
Hmm not sure how to make it simpler. There is no such thing as "finding a block". Block are already known. What we are looking for is a hash which is SMALLER than the TARGET required by the current DIFFICULTY.
Thus if a hash (any hash) is smaller than both Bitcoin and Namecoin targets it "solves" both blocks. Since Bitcoin target is higher than namecoin target any hash which is small enough for Bitcoin will be by default also small enough for Namecoin.
Whoa.. I realize I know nothing of the mechanics now..
I just thought they were separate networks of sorts.. Im surprised to find it works like this..