Heck, I'm even recruiting when I visit other companies. Have a great product. I may have an advantage here. Argonne National Lab's main product is scientific innovation. It's tough to top that.
Great products attract great people.
Get out there and give them the chance. Reinforce good work. Make it a point to show everyone how an employee's contribution matters. Require positive, public recognition for every employee at least once per year. Hold your managers to that goal and require good reasons for not doing it.