T (before): "I think we are selfish by nature. The whole premise behind evolution is selfish... survival. With humans, it's collaborative selfishness (we all work together because we gain more from it). It's ironic that the competitive mechanism of evolution would have produced such a cooperative species. Oh well. Maybe God has a sense of humor. Just look at the platypus :o)"

B: "What is with the platypus?" beez.

T: It's a duck billed mammal that lays eggs (I think). It just plain looks funny.

B: Yeah, I know that critter... Hmmmm...what sounds makes a platypus? Like a duck?