Is my little sister weird for her age?

She's five and she's always watching PBS and History Channel. She will sit down with anybody and talk their ear off about every war you can think of, especially the Civil War and WWI & WW2. This obsession started when she was just a little over two years old and she saw some documentary about WW2 and started telling everyone about "Hitter" and "Tuchill" (Hitler and Churchill lol). She sat through the WHOLE Ken Burn's Civil War documentary back to back and we couldn't even tear her away to eat dinner! My mom let her have carrots sticks and cheese and crackers in the living room instead since she didn't want to discourage her educational interests.