The closest I can think of is "Tüftler", but that really doesn't capture the science-y aspect and is more hands-on. More the guy building a fusion reactor in his garage, less the group designing a radar device in some government lab.
The closest I can think of is "Tüftler", but that really doesn't capture the science-y aspect and is more hands-on. More the guy building a fusion reactor in his garage, less the group designing a radar device in some government lab.