The term 'nerd' needs to complete its rehabilitation like 'geek' has the last 20 years. It's the most concise term I can think of when describing someone who is

The term 'nerd' needs to complete its rehabilitation like 'geek' has the last 20 years. It's the most concise term I can think of when describing someone who is enthusiastic, focused, and knowledgable on a subject. I think it's a badge of honor