C. The mother’s heart is the child’s schoolroom.

　　D. What sculpture is to a block of marble, education is to the soul.

　　D

　　When a laptop or smart phone battery starts losing its power, the only options are to buy an expensive replacement, or just keep it plugged in all the time. But one woman may have found the answer to this problem.

　　Mya Le Thai is a scientist studying at the University of California. She recently discovered a process that may lead to batteries that last forever.

　　Thai said she had been frustrated that the batteries for her wireless devices degraded over time, until they failed to charge fully. Thai did not like having to keep her laptop connected to an electrical outlet(电源插座) to keep it powered on. So, she decided to do something about that problem. At first, she and her team at UC Irvine thought about inventing a new battery. But as they experimented, Thai discovered something that might permit lithium-ion(锂离子) batteries to last forever.

　　Lithium-ion batteries power most wireless devices. Over time, the batteries lose the ability to hold a charge. Most of these batteries have a life span of about 7,000 charging cycles before they die. One of the reasons lithium-ion batteries degrade is their use of nanowires to carry electricity. Nanowires are extremely thin, A human hair is thousands of times thicker, for example. Nanowires are extremely efficient carriers of electricity, which makes them useful in batteries. But Thai said their thinness also makes them weak. "Nanowires break and fracture over time,” she said. “That's why they lose capacity.”

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