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Historically, it has been used as an icon in various religious and occult contexts. How many edges are there in a pentagram?
Around planet Earth there are approximately 25.000 nautical miles. How long is the international nautical mile?
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?