Sometimes, you need an Android tablet that's easy to hold one-handed, or that doesn't hog space in a bag, here are the best.

在虚拟实验室里借助实验工具来探索各种元素。可以将元素放入离心机中旋转，将它们放到加热器中加热，或将元素放到带有制冷剂的冰块上，从试管添加一到两滴神秘液体，用示波器更改电动势并使其充磁。