2 . The door of a small cage opens up and a bird flies into a large enclosure (围场). The bird lands on a tree and moves its red head to the side, as if it is surprised. “That’s what it feels like to be free,” said Juan Camilo Panqueba, who works at a wildlife center in the Colombian city of Bogota, far from the Caribbean coast, where the bird usually lives.

Birdsong contests have taken place all over the Caribbean for hundreds of years. Although catching any wildlife is not permitted by the law, wildlife trafficking (非法交易) still happens a lot in Colombia, as the officials were too busy fighting with the drug trade, nongovernment fighters and other dangerous groups. Until recently, they did not enforce (强制实施) the law. Now, as dangerous groups have fallen and with the drug trade mostly destroyed, officials are taking another look.

Three weeks ago, Colombian officials saved birds from a group. The group was mostly people who had recently moved to Bogota from the Caribbean and Venezuela. Officials accuse (控告) the group of setting up a songbird competition on social media. In a closed Facebook group, crowds cheered and recorded the loudness and the number of calls from each bird. The owner of the winning bird received＄100, and people who correctly predicted the winner could also win money. Environmental officials say the birds were badly hurt, because they were kept in the small cages and forced to listen to loud music all day long to make sure they can sing. In the wild, the birds sing to protect themselves or find a mate. “For them, it was like cruel harm,” noted Juan Camilo Panqueba, who works at Bogota’s wildlife center. There, he and others care for birds and more than 1, 000 animals.

Colombians have grown to understand the importance of wildlife, and officials are working to end animal trafficking.

3 . Your best friend that follows you around when the sun comes out - your shadow - doesn’t serve an important function like your heart or brain, but what if you could use shadows to create electricity? When using solar panels (电池板) that are powered by light, shadows can be boring because it means electricity can’t be created. However, researchers from the National University of Singapore have engineered a way to create power from the shadows present everywhere.

A team of the university created a machine that can collect energy from shadows. It is created by placing a thin coating of gold onto silicon (硅). Like in a normal solar panel, when put in light, the silicon electrons (电子) become energized and the energized electrons then jump from the silicon to the gold. The voltage (电压) of the part of the machine that is placed in the light increases relative to the dark part and the electrons in the machine flow from high to low voltage. They are sent through an external circuit (外电路) creating a current that can be used to power another machine. The greater the contrast between light and dark, more energy is provided by the machine.

The team is working on improving the performance of the machine, borrowing approaches from solar panels to gather light. Increasing the amount of light the machines can receive allows them to better make use of shadows, as well as developing shadow energy collecting panels that can successfully gather from indoor lighting. The team is also researching the use of other materials other than gold to drop the price of the machine, meaning they would be more cost effective and easier to apply in society.

Shadows are present everywhere and perhaps one day in the future we will be able to collect energy from them by placing the shadow-effect energy machine around the world in places that have been considered unfit for solar panels to work, or indoors. “A lot of people think that shadows are useless,” Tan says, but “anything can be useful, even shadows.”

5 . Think of Japan in the spring and the image that comes to mind is likely the country’s famous cherry blossoms, also known as “Sakura” — white and pink flowers, blooming across cities and mountains.

The flowers, which experience a “peak bloom” that only lasts a few days, have been loved in Japan for more than a thousand years. Crowds celebrate with viewing parties, flocking to the most popular locations to take photos and have picnics underneath the branches.

But this year, cherry blossom season has come and gone in the blink of an eye, in one of the earliest blooms on record. Scientists warn it’s a symptom of the larger climate crisis threatening ecosystems everywhere.

Yasuyuki Aono, a researcher at Osaka Prefecture University, has gathered records from Kyoto back to 812 AD from historical documents and diaries. In the central city of Kyoto, cherry blossoms peaked on March 26, the earliest in more than 1,200 years, Aono said. And in the capital Tokyo, cherry blossoms reached full bloom on March 22, the second-earliest date on record.

The peak bloom dates shift every year, depending on numerous factors including weather and rainfall, but have shown a general trend of moving earlier and earlier. In Kyoto, the peak date stayed around mid-April for centuries, but began moving into early April during the 1800s. The date has only dipped into late March a handful of times in recorded history.

“Sakura blooms are very temperature sensitive,” said Aono. “Flowering and full bloom could be earlier or later depending on the temperature alone,” he said. “The temperature was low in the 1820s, but it has risen by about 3.5 degrees Celsius to this day.”

This year’s seasons in particular influenced the blossom dates, he added. The winter was very cold, but the spring came fast and unusually warm.

6 . Each year, the women of Olney and Liberal compete in an unusual footrace. Dressed in aprons (围裙) and headscarves, they wait at both towns’ starting lines. Each woman holds a frying pan with one pancake inside. At the signal, the women flip (轻抛) pancakes and they’re off!

This “pancake racing” tradition is said to have started on Shrove Tuesday, 1445, in Olney. Shrove Tuesday is the day before the Christian season of Lent (大斋戒) begins. During Lent, many people decide to give up sugary or fatty foods.

Legend says that in 1445, an Olney woman was making pancakes to use up some of her sugar and cooking fats before Lent. She lost track of time and suddenly heard the church bells ring, signaling the beginning of the Shrove Tuesday service. Realizing that she was going to be late for church, she raced out the door still wearing her apron and headscarf and holding her frying pan with a pancake in it. In the following years, the woman’s neighbors imitated her dash to church, and pancake racing was born.

The rules are simple. Racers must wear the traditional headscarf and apron. They must flip their pancakes twice - once before starting and once after crossing the finish line. After the race, there are Shrove Tuesday church   services. Then Liberal and Olney connect through a video call to compare race times and declare a winner.

In both towns, the races have grown into larger festivals. Olney’s festival is an all-day event starting with a big pancake breakfast. Liberal’s festival lasts four days and includes a parade, a talent show, and contests that feature eating and flipping pancakes. Although the women’s race is still the main event, both towns now hold additional races for boys and girls of all ages.

7 . Arguing with your parents is totally natural for teens. From your hairstyle to your friends, to your marks at school, to your television habits, to your future plans, it might just seem like you argue with your parents about everything. While this is not generally a pleasant state of affairs, it is normal and it will most likely pass.

Argue fairly

Arguments between teens and parents generally come about when both parties believe that they know what is best for the teen. Parents have been caring for their teens for over a decade, but teens are quickly becoming adults and believe that they are able to take care of themselves. If you must agree with them, argue fairly by: Allowing each person to speak their mind. Refusing to interrupt others   when they are speaking. Sticking only to the topic at hand.

Argue respectfully

No matter how heated things may get during an argument, try to remember that your parents still are worthy of your attention, respect and love. During arguments, be respectful by: Keeping your voice lowered at all times and refusing to shout. Sitting still and staying calm. Refusing to engage in angry actions such as kicking, throwing or hitting anything. Reasonably explaining the reasons for your opinions.

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There is a thin line between having a discussion and engaging in an argument, but smart teens know that keeping their interactions with their parents at the discussion level practically guarantees that they will be taken more seriously. No one likes to argue, and the parents of teens can be especially weary of it, so keeping things at the discussion level will work to everyone's advantage.

Arguing with parents is practically a sign of the teenaged years, but out-of-control arguments don't serve anyone well. Before arguing with your parents, decide what type of teen you want to be and what compromises (妥协) you are willing to make in order to achieve your goals. You never know, you might just avoid an argument all together.