Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...
The instructor filled an empty jar with rocks. “Is it full?” Then he poured a pitcher of pebbles into the jar. “Full now?” Next he poured sand. “Full?” Finally, he poured water. “Now it’s full.” “What ...
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