antikythera-astronomy: Do you know why your blood is red? Because it’s got iron in it. Any idea where the iron in your blood came from? A supernova. Let me explain: Stars have lots of gravity. To balance the force of this gravity from crushing a star

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antikythera-astronomy: Do you know why your blood is red? Because it’s got iron in it. Any idea where the iron in your blood came from? A supernova. Let me explain: Stars have lots of gravity. To balance the force of this gravity from crushing a star

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