Long bus rides are like television shows.They have a beginning，a middle，and an end with commercials(广告) thrown in every three or four minutes.The commercials are unavoidable.They happen whether you want them or not.Every couple of minutes a billboard glides by outside the bus window.“Buy Super Clean Toothpaste.” “Drink Good Wet Root Beer.” “Fill up with Pacific Gas.” Only if you sleep，which is equal to turning the television set off，are you spared the unending cry of “You Need It！Buy It Now！”

    The beginning of the ride is comfortable and somewhat exciting，even if you've traveled that way before.Usually some things have changed—new houses，new buildings，sometimes even a new road.The bus driver has a style of driving and it's fun to try to figure it out the first hour or so.If the driver is particularly reckless (鲁莽的) or daring，the ride can be as thrilling as a suspense story.Will the driver pass the truck in time？Will the driver move into the right or the left hand lane？After a while，of course，the excitement dies down.Sleeping for a while helps pass the middle hours of the ride.Food always makes bus rides more interesting.But you've got to be careful of what kind of food you eat.Too much salty food can make you very thirsty between stops.

    The end of the ride is somewhat like the beginning.You know it will soon be over and there's a kind of expectation and excitement in that.The seat，of course，has become harder as the hours have passed.By now you've sat with your legs crossed，with your hands in your lap，with your hands on the armrest or even with your hands crossed behind your head.The end comes just at the right time.There are just no more ways to sit.

Best Inventions

    Sun Power

    People who buy solar panels (嵌板）for their home hope to help the environment and save some money. But they end up with large metal boxes on their roof. Tesla, a car company, solved the problem. The solution is the Solar Roof. It is a series of tiles (瓦) made to look like traditional roofing material while using the power of the sun. Tesla developed it with SolarCity, a longtime provider of solar panels. It is now available to the public.

    Talking Tech

    Echo gives users the ability to talk to their tech. Apple's Siri and Microsoft's Cortana do that too. But in many ways，Amazon's version，Alexa, which is built into Echo，is more powerful. Alexa has grown since it was put on the market in 2014, and today, you can use it to turn on the lights, order a pizza, and more. Echo costs $ 180. Amazon recently developed a junior version, the $ 50 Echo Dot.

    Spin and Roll

    Goodyear is reinventing the wheel. It introduced its Eagle 360 spherical tire (球形轮胎) in March, 2016. The tires allow cars to move in many directions, including sideways, and at angles to handle slippery surfaces. The key is magnetic levitation (磁悬浮). Tires are fixed to cars, but Eagle 360s float beneath them. They're meant for self-driving cars of tomorrow.

    Cycle Safety

    Jeff Woolf had a serious bike crash. If he hadn't been wearing his helmet, he would have been badly hurt. He wondered why so many riders didn't wear helmets. That turns out it was mostly because helmets were big and hard to carry around. Woolf, an engineer, came up with Morpher. The helmet is made from interwoven plastics (交错编织的塑料). It is strong, but it's also flexible enough to fold almost totally flat. That makes it easy to carry. Morpher is priced at $ 119.

    One night about nine o'clock, Dr. Eyck, a surgeon, had a phone call from Dr. Haydon at the hospital in Clens Falls. The surgeon was asked to go there at once to operate on a very sick boy who shot himself while playing with a gun.

    The doctor was soon on his way to Clens Falls. It was 60 miles away. And it was snowing heavily in the city. The surgeon thought he could get there before 12 o'clock.

    A few minutes later, the doctor was stopped by a man in an old black coat. Gun in hand, the man ordered the doctor to get out. Then the man drove the car down the road, leaving the doctor in the falling snow.

    It was after 2 o'clock in the morning when the doctor arrived at the hospital in Clens Falls. Dr. Haydon told him that the boy had died an hour before.

    The two doctors walked by the door of the hospital waiting room. There sat the man in the old black coat with his head in his hands.

    "Mr. Cuninghan," said Dr. Haydon to the man, "This is Dr. Eyck. He is the surgeon who walked all the way from Albany to save your boy."

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

    Thai was frustrated that the batteries for her wireless devices degraded(降级)over time, until they failed to charge fully. She did not like having to keep her laptop connected to an electrical outlet 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 had a theory—the nanowires might last longer if covered with a gel(凝胶). She and her team tested this theory. "It was a long process and a lot of work, "Thai said. The team tried many coverings for the wires. PMMA, a type of plastic, was one of them. The nanowires were coated with PMMA and cycled through charges 200, 000 times. The PMMA-coated nanowires showed no evidence of damage. The results suggest that batteries could last forever, without losing charging ability.

    Thai hopes to continue her research to understand why this gel works so well and to see if any other gel could create better results and she is enjoying the publicity about her discovery. She said she never expected her research to get media coverage. "It's kind of cool," she said. "I'm really glad people are showing interest in my work and not just in the work itself, but also in technology and energy."

    Dear young poets, TIME For Kids has a challenge for you: Write a rhyming poem and enter it in the TFK Poetry Contest. It must be a poem that does not copy another poet's works.

    How to enter: This contest will begin 12 pm on April 14, 2019 and will end 12 pm on June 14, 2019. To enter online, visit timeforkids.com/2019poetrycontest and follow instructions to submit the following: (a) an original and previously unpublished poem; (b) the entrant's first name only and e-mail address; (c) a parent's e-mail address. Limit one entry per person or e-mail account.

    Judging: All entries will be judged by poet Kenn Nesbitt, based on the following criteria: creativity and originality (50%), use of language and rhyme (25%) and appropriateness to contest theme (25%). Winners will be notified by e-mail during the month of July and must respond within five days.

    Eligibility (参赛资格)：Open to legal citizens of the United States who are primary school students and are 8 to 13 years old at time of entry.

    Prizes: Our judge will select four semifinalists, from whom one grand-prize winner and three finalists will be chosen. The one grand-prize winner will receive an online class visit from Kenn Nesbitt. All the semifinalists will receive a signed copy of Bigfoot Is Missing, which is worth about $ 275. The semifinalists' poems will be published at timeforkids.com.