Put static mats under the work stations. Teach the kids to touch the static pad before they touch the machines.
Things like chairs with steel casters and a static treated carpet/floor help. Back in the olden days a computer room floor was conductive and bonded. So were the carpet mats at the consoles. It was high resistance but it was conductive.
Machines are getting better with ESD but it still can be a problem if you can't control humidity.
