The last ice age endured for over 90,000 years before the current warm stable period began 11,000 years ago. But when the ice age did come to an end, it did so in just 20 years - just one human generation. Imagine the generation gap between the adults who'd grown up in a world dominated by the unforgiving ice and cold, and the first generation of children growing up in a benign temperate climate.
A snake's forked tongue allows it to "taste" the air in stereo - providing it with a "nose" that can detect both the presence and direction of "interesting" odors - such as the pheromones of a female snake during the mating season.
Mass produced PC products make up less than 10% of the $92.8 billion software market in the US.