Answer:
In Paris but not in France, the thinnest of its siblings.
What has three ways out and just one way in?
What word in the English language uses all five vowels plus Y in alphabetical order, and uses each only once?
It's got twists and turns, but has no curves. Twist it to fix it, turn it to ruin it. What is it?
What has a spot and is very bright, is sometimes, red, white, blue, yellow or green and is often blinding.
What is so fragile that saying its name breaks it?