This week’s Item of the Week is the Becker Bottles “One in a Million.” This teaching tool helps students visualize what 100,000, 10,000, 1,000, 100, 10, and 1 parts per million (ppm) looks like. Yellow and red beads, which illustrate 100,000 and 10,000 ppm are easy to find, whereas white, pink, green, and black beads,…
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