Koh-I-Noor pens and Tombow Abt brush markers

I tell my students that "heavy" is a scientifically useless term.  What may be heavy to one may not be to another.  Something too heavy to lift for me is nothing for a construction site crane.  And if you define an elephant as "heavy", how do you define an oceanliner, or an average planet?  In science you need to use numbers, or at least "greater than" or "less than".  Merely saying "heavy" is unenlightening.

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