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The use of this metal and chemical element can be traced back to 3,500 BC. Which chemical element is number 28 in the Periodic Table?
We breathe this chemical element every day and with each breath we take. Which number in the periodic table has oxygen?
Which chemical element is the lightest, but at the same time it is estimated to take up 3/4 of the Universe's mass?
Which of the following countries was not one of the original members of the European Coal and Steel Community, the predecessor to the EU?
Which of the following children's diseases can be dangerous if you are pregnant?
How old could the Danish philosopher Søren Kierkegaard, in theory, have been in 2013?