Q: The Olympic Stadium in which city was completed in 1938 and has hosted two World Athletic Championships, three Europeans and one Olympics, but not the one it was built for?
What is the answer?

A: helsinki

Q: The cobalt salts of aluminium/aluminum oxide produce what colour/color in ceramics, glass, etc., notably ancient Chinese porcelain?
What is the answer?

A: blue

Q: In which war were there two battles of Bull Run
What is the answer?

A: american civil war

Q: In an e mail address, how is a symbol like a period said out loud?
What is the answer?

A:
dot