If Isaac Newton hadn’t sat under an apple tree, he wouldn't have discovered it., If 3M scientists hadn't made weak glue, we might not have this., If Percy Spencer's chocolate hadn't melted, he wouldn't have helped invent this applience., If Röntgen hadn't noticed the strange glow, he might not have discovered it., If George de Mestral hadn't noticed the seeds on his dog's fur, he might not have invented this., If the scientist hadn't dropped the flask, this might not have been developed., If John Walker hadn't scraped the chemical stick, he might not have invented them.

evolve 4 unit 10.1

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