Millions of ash trees are dead in Ohio, victims of the emerald ash borer pest. Which means millions of chances exist for Ohioans to cut the trees down using chainsaws. Fortunately, demonstrations in the Gwynne Conservation Area at CFAES’s upcoming Farm Science Review, sawdust flying, will show how to do it safely and right. “Chainsaw Maintenance: Sharpening and Safety,” 11 a.m. to noon on all three days of the Review, Tuesday, Sept. 18, Wednesday, Sept. 19, and Thursday, Sept. 20. “Chainsaw Cutting Techniques,” 12:30-1:30 p.m., also all three days. See the full Gwynne schedule.