We got some calls Tuesday afternoon from concerned residents over ‘lots of smoke’ lingering over the county.  One caller said it looked like half the  county was on fire.  A check with the County Fire Department told us that TWRA was doing a prescribed burn on the Catoosa Wildlife Preserve – a controlled burn.  It was explained to us this way:  A prescribed burn is designed to help clear the forest bed to promote the regrowth of a more diverse habitat. Prescribed fires prepare sites for seeding of native grasses, control insects and diseases, as well as improving habitats for wildlife.