The workday can get so hectic you just need a breather from computers and voicemails and people you spend at least 40 hours a week with. Head downtown to the Dallas World Aquarium and take a lesson from a creature who really knows how to slow down. For the price of a counter-service lunch, you can cruise on through to visit a three-toed sloth. We've gotten to know Bella, our fave, but we hear the other two, Leno and Samba, are just as slow-going and amiable. Take a lean and watch the hairy mammal hang out on its tree, moving in slo-mo. Unlike other exhibits at the aquarium, the sloth isn't caged or enclosed, but free to reach out and slowly latch onto someone's hair (a highlight from one of our visits) or grab camera straps. But most often, they just appear to sleep. They're models of how to relax.