There are two ways of driving in the world: if the driver's seat is on the left and cars travel on the right side of the road, it is called “left-hand driving”, as it is in China, while the other way of driving is called “right-hand driving”, as it is in Britain. Nowadays, around 65% of the world's population drives on the right of the road, while the rest is used to driving on the left.

    Though no one knows the exact reasons, it seems likely that people in ancient times travelled on the left. Roman coins show pictures of horsemen passing on each other's right. And right-hand people generally got on a horse from the animal's left. Obviously, it's safer to do this at the left side of the road, and it makes sense for the horse to be ridden on the left.

    A change happened in the late 1700s. When Napoleon conquered nations, he forced them to travel on the right side of the road, which spread left-hand driving throughout Europe. However, Britain still stuck with the right-hand driving rule and countries which were part of the British Empire (帝国) were made to follow. This is why India, Australia and the former British colonies (殖民地) in Africa continue to drive on the left. One exception is Egypt, as that country was defeated by Napoleon before becoming part of the British Empire.

    Some countries changed sides' until modem times. Sweden only moved to driving on the right in 1967 and Iceland changed the following year. Ghana changed sides in 1974. On September 7,2009, Samoa became the third country ever to change from left-to-right-hand driving for the reason that it made it easier to import (进口) cheap cars from right-hand driving Japan, Australia and New Zealand.

    So if you want to travel to another country or go on business, make sure you know whether it is left-or right- hand driving to avoid unnecessary troubles.

    The Amazing Penguin Rescue

    The summer of 2016, the ship MV Treasure sunk, creating an oil spill. Thirteen hundred tons of fuel oil were flowing right in the middle of the African Penguins' habitat. Soon the oil covered about 20,000 penguins. Without swift help, the seabirds would have no chance for survival. Volunteers were showing up by the thousands and I also took part in what was the largest animal rescue operation ever.

    A warehouse was turned into a rescue center near the habitat and hundreds of pools were built to hold about 100 oiled birds each. When walking into the center, I couldn't believe my ears. I had expected to walk into a chorus of honking and squawking(叫声). Instead, the center sounded like a library. The penguins were dead silent. My heart ached for the painful birds. Cleaning them all seemed like an impossible task. But we had to carry on like doctors in an emergency room. There was no time for doubt. Cleaning oil off a penguin wasn't easy. Even with more than 12,500 volunteers, it took a month to bathe all 20,000 birds at the center.

    While volunteers were busy bathing the oiled penguins, another crisis (危机) was developing. Oil from the spill had started moving north. Tens of thousands of penguins were in the oil's path. But we already had our hands full with 20,000 recovering birds. If any more birds were oiled, we wouldn't have enough resources to save them.

    One researcher came up with an idea: What if the penguins were temporarily moved out of harm's way? Experts decided to have a try. Volunteers rounded up the penguins and released them 500 miles away. The hope was that by the time the seabirds swam home, the oil would be gone. The plan worked! Another 20,000 penguins were saved.

    The entire penguin rescue took about three months. More than 90% of the oiled penguins were successfully returned to the wild. Looking back on the rescue, I am still amazed by the work of the volunteers. What I could hardly believe was that we accomplished an impossible task.

    Day tripping: discover the Thames Valley by train this summer

    Footloose and fancy-free fun is what summer is all about and there's no better way to go on a stress-free day trip than by train. Here's our pick of festivals and events that are an easy hop from London Paddington.

    May 26-28

    Blenheim Palace Food Festival        Nearest station: Hanborough

    Sink your teeth into local cheeses, slurp local ales（麦芽酒）and get inspired to cook with Oxfordshire produce at live demonstrations during this annual food festival, Better still, gather some goodies and go for a picnic within its beautiful parklands. Flowers more your thing? The Blenheim Palace Flower Show also takes place here, from June 22 to 24.

    June17

    Marlow Dragon Boat Festival                Nearest station: Marlow

    Head down to the banks of the Thames early to bag a good spot to see the teams go head-to-head at this colourful dragon boat racing spectacle in Marlow. The free event, which is part of the wider ticketed Marlow Town Regatta（划船比赛）and Festival, promises to be a lively day out. There will be food stalls and free entertainment, too, to keep the cheering crowds amused.

    August 24-26

    Wokingham Festival            Nearest station: Wokingham

    Hop on the free shuttle bus from Wokingham train station to join in the good-old-fashioned fun at this charming community festival in Berkshire. Centering around Cantley Event Field, it promises a beer festival, live music, food stalls, and plenty to keep the little ones happy, from face painting to circus（马戏团）skills. Kids go free.

    I live on the West Coast of British Columbia with my husband and three children. Our day started like any other day. My husband left for work in the north of the town, which is an hour and a half's drive. The younger children caught their bus to school ten minutes away. Our oldest attends high school and is a 40-minute drive away. I work at home in the office, working on the computer.

    It was November 2006 and the news had reported gusty winds. When the winds started to get strong I shut the computer down and tried to phone my husband. I left a message telling him the winds were blowing at 80 to 90 km/hr. As I hung up the phone, I heard a tree crack. I went outside and stood in the driveway. Another tree exploded and my heart was racing.

    When the school bus carrying the youngsters arrived, I ran to get them. No sooner had we made it to the house than another tree exploded. The children were clearly scared, so I loaded them up into the car and we parked in the middle of the yard, where no trees could land on us, it was starting to get dark.

    My oldest son didn't come home on the bus and my husband was stranded at work. I called the high school and reached my son. He said he was stranded and didn't know what to do. I called a friend in town for help. He managed to get my son home to me. Finally, my husband managed to get home.

    We had been prepared for such events, as we had a generator, candles, a wood stove, fresh water, batteries and two freezers full of food. We were without power for five days. But we didn't panic we had all the emergency equipment we needed. Thankfully, none of our neighbours were injured, but the damage was extensive. We are witnessing climate change. We need to be prepared.

    Alan Naiman was known for being very careful about how he spent his money. But even those closest to him had no knowledge of the fortune he quietly gathered and the last act he had planned.

    Naiman died of cancer at age 63 last January. The man from the American state of Washington gave most of his money to groups that help the poor, sick, disabled and abandoned children.

    He gave them $11 million. The large amount of his fortune shocked the groups that received his gifts and even his best friends. That is because Naiman had been known to repair his own shoes with duct tape. He had sought deals to buy food from grocery stores at closing time and taken friends out to lunch at low cost restaurants.

    Naiman died unmarried and childless. He loved children but also was intensely private. He saved, invested and worked extra jobs to gather money. He rarely spent the money on himself after seeing how unfair life could be for children who suffer most.

    Naiman was a former banker who worked for the past 20 years at the state Department of Social and Health Services. He earned $67,234 a year and also took on side jobs. Sometimes, he worked as many as three at a time. He saved and invested enough to make several millions of dollars. He also received millions more from his parents after they died.

    He left $2.5 million to the Pediatric Interim Care Center in Washington. The center is a private organization that cares for babies born to mothers who abused drugs and children with drug dependency. The center used the money to pay off its mortgage (按揭) and buy a new vehicle to transport the children.

    Naiman gave $900, 000 to the Treehouse, where children without parents can choose toys and necessities for free. Treehouse is using Naiman's money to expand its college and career support services Statewide.

Plants may tell us when they're in trouble.Thirsty tomato and tobacco plants make clicking sounds,researchers have found.The sounds are ultrasonic (超声波的),meaning they are too high-pitched for human ears to hear.But when the sounds are transformed to lower pitches,they sound like popping bubbles (爆破的泡泡).Plants also make clicks when their stems (茎) are cut.

"It's not like the plants are screaming," says Lilach Hadany,an evolutionary biologist working at Tel Aviv University in Israel."Plants may not mean to make these noises.We've shown only that plants create informative sounds."

Hadany and her colleagues first heard the clicks when they set microphones next to plants on tables in a lab.The microphones caught some noises.But the researchers needed to make sure that the clicking was coming from the plants.So,the scientists placed plants inside soundproof boxes in the basement,far from the noise of the lab.There,microphones picked up ultrasonic pops from thirsty tomato plants.Though it was outside humans' hearing range,the clicking made by plants was about as loud as a normal conversation.

Cut tomato plants and dry or cut tobacco plants clicked,too.But plants that had enough water or hadn't been cut stayed mostly quiet.Wheat,corn and grapevines also made sounds when stressed out.

The researchers don't yet know why plants click.Bubbles forming and then popping inside plant tissues that transport water might make the noises.But however they happen,pops from crops could help farmers,the researchers suggest.Microphones,for example,could monitor fields or greenhouses to detect when plants need to be irrigated (灌溉).

Hadany wonders whether other plants and insects already tune into plant pops.Other studies have suggested that plants respond to sounds.And animals from pests (害虫),moths to mice can hear in the range of the ultrasonic clicks.Sounds made by plants could be heard from around five meters away.Hadany's team is now studying what the living things near the plants will do after hearing the sounds.