Since we all have indoor kitchens, it can strike one as a little funny, when you think about it, how many humans love to venture outside their perfectly conditioned interiors to BBQ their food in the thick of the summer heat. But there are lots of good reasons to grill out—some of them practical, some social, some of them even biological.Here are eight of Bart Fireside’s best reasons to fire up your barbecue tonight:http://www.jblgarden.com/bbq/