Ideas about the nature of light have been around for thousands of years, but until Newton came along in the 17th century most of these attempts were little more than speculation. Newton himself held to the view of light as composed of huge numbers of tiny "corpuscles", or particles, which bounce of mirrors and are absorbed by dark objects, etc. It wasn't a bad idea, really. It explains shadows very well, for instance. If you stand in the way of particles, they can't go through you and so you'll leave a shadow behind you where the light particles have failed to hit.
家事と仕事を両立できないなら子供を持っちゃ駄目？ | 妊娠・出産・育児
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新規抗リウマチ薬で認知症リスク低減 生物学的製剤とＪＡＫ阻害薬 : yomiDr /ヨミドクター（読売新聞）
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