Hardest substance on earth?
My ancient old ncert textbook says it is diamond. But it isn't. What is it?
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Hardest substance on earth?
My ancient old ncert textbook says it is diamond. But it isn't. What is it?
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pls yrr
co.me on sna.p
I h.ave giv.en y.ou m.y id.
pls tel.l your na.me whe.n you mes.sag.e me