爆米花为什么会“爆”？

Popcorn pops because of water inside. 爆米花会爆，全靠玉米粒里的水。 Every kernel hides a tiny drop of water. 每粒玉米，都藏着一小滴水。 Heat turns that water into hot steam. 一加热，小水滴变成滚烫的蒸汽。 Steam pushes hard from the inside. 蒸汽在里面，使劲往外顶。 When the shell cannot hold, it breaks. 外壳撑不住了，砰地一下炸开。 The inside puffs up like a white cloud. 里面的米花，胀成一朵白云。 That is the magic of one small corn. 一颗小玉米，就这么变魔术。