The Hardest Substance Known to Man

My sister learning
for her Chemistry –
years ago:
“Diamonds are
the hardest substance
known to man,”
apart from
and then

This entry was published on February 4, 2016 at 12:15 pm. It’s filed under Promote yourself, Uncategorized and tagged , , , , , , , , , , , , . Bookmark the permalink. Follow any comments here with the RSS feed for this post.

One thought on “The Hardest Substance Known to Man

  1. Pingback: The Hardest Substance Known to Man | cheryl62blog

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