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two external drives suddenly disabled after connection with macbook pro (big sur)

I purchased two external drives of 5Tb from Western Digital. I formatted the drives using disk utility program (OS with journalling). I connected the first and started to make backups using time machine. I thyen connected an unrelated disk to transfer my movie library from my macbook pro to, to diminish the data on mu […]

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[ Chemistry ] Open Question : How does the classification of the elements used today compare to that used thousands of years ago?

does anyone have a clue?

Categories
Ask Chemistry

[ Chemistry ] Open Question : How does the classification of the elements used today compare to that used thousands of years ago?

does anyone have a clue?

Categories
Ask Chemistry

[ Chemistry ] Open Question : How does the classification of the elements used today compare to that used thousands of years ago?

does anyone have a clue?