I think the roo question is about time of day when most active. Roos tend to sit around in the heat of the day, and move around at dusk/dawn. It's too fucking dark at night to go anywhere (if you're a roo, that is).
I've always wanted to know if there is any way to determine the level of brain damage I've sustained over years of drug use (including alcohol of course). I think I used to be smarter - but I'm definitely wiser now, which probably compensates for any reduction in brute processing power...