在线英语听力室_免费在线英语听力学习网站

If you’ve ever had a garden or grown flowers in a window box, you’ve probably heard that you shouldn’t water your plants at high noon because their leaves might scorch¹. Now a study in a journal called New Phytologist confirms that water droplets² can focus sunlight to the point that it burns, a finding that applies to plants and to people.

 Check any gardening blog and the question of whether water can burn comes up with some regularity³. But the problem had never been thoroughly⁴ tested. So scientists at Eotvos University in Budapest decided⁵ to do just that. And they found that the results depend on how hairy you are.

On leaves that are really smooth, like those from a maple⁶ tree, water doesn’t do much damage. But leaves that have tons of tiny hairs, like a fern, can hold spherical⁷ water droplets in focus above a leaf’s surface. Those drops act like mini magnifying glasses, focusing the sunbeams on an area that will subsequently fry.

And the same is true on you. Cooling off in the pool might seem like a stellar idea. But the resulting water droplets, propped⁸ up by your body hair, poolside, could turn you from lounger to lobster⁹.

 —Karen Hopkin