I've never heard of an Electric Violin! When did you learn to play it?
I learned to play it when I was 10! It's more similar to a violin than people think. Just it's electric.
Is the body different? Does it change the sound from an acoustic violin?
Yes it usually has a smaller body. It has a crisper sound but some prefer the sound of a traditional violin.
You know, I think I may have seen some on tv. They can actually have an open body, right? Like the Cecilio (per the internet)
Yes. The type of body can change the type of sound it makes in subtle ways. Even I don't understand all of them 
Do you think anyone can learn to play the violin? It is beautiful.
Yes. It can take some practice but it definitely is worth learning how to. 
I guess there are smaller sizes for children vs adults?
Possibly I'm not sure of the exact details