If our blood used copper rather than iron (cyanoglobin as opposed to haemoglobin), what colour would it be?
Answer
Green.
Blue.
Red.
Yellow.
Question 4
Question
If you were on the pavement (or sidewalk I guess) by the Empire State Building and were hit on the head by a penny dropped from the top, what would happen to you?
Answer
It would kill you.
It would cause a nasty gash but probably wouldn't be fatal.