【推荐2】You have probably eaten a hot dog, but have you ever spotted a sundog? This isn’t your pet dog napping in the sun!

A sundog is a weather event that causes two bright bursts of rainbow colored light to appear on either side of the sun. You would see them around 3 o’clock and 9 o’clock. Sundogs can be very beautiful, with a red glow closest to the sun and a white in the center. The scientific name for sundogs is parhelia, which comes from a Greek word meaning “beside the sun”.

Conditions need to be just right for sundogs to appear. Sunlight passes through high clouds that spread out like feathers in front of the sun. These clouds contain flat, six-sided ice crystals (晶体). If the crystal drifts toward the ground, with the larger face facing the Earth, light is refracted (折射). These crystals then separate the light, forming a sundog.

Sundogs can be seen during any season but are most often seen during the winter months when the sun is lower in the sky. You are also more likely to see them early or late in the day, when the sun is near the horizon. Sundogs have been spotted around the world, across North America, Europe, and Asia, at the South Pole and in the far north. Scientists have even predicted what sundogs might look like on other planets.

Throughout history, sundogs have been used to predict weather because they indicate snow or rain on its way. Some people believed that sundogs were a sign of good luck, while others saw them as a warning from God. Shakespeare described sundogs in poems as frightening.

Ready to try out your weather detective skills? First, use your hand to block the center of the sun to protect your eyes. Search for clouds in a winter sky and a circle or burst of light around the sun. Be sure to show off your sundog smarts to your friends and family — you’ll be their top dog!

【推荐1】Set 40 kilometers northeast of the city of Ambatondrazaka, the Zahamena National Park's landscape consists of (……组成) valleys surrounded by a flowing mountain range.

It has an overall land coverage of 64, 300 hectares, but only 42, 000 hectares is open to the public due to strict conservation (环境保护) reasons. It receives an average yearly rainfall level of about 6 feet and experiences frequent rain showers even during the dry season between April and October.

One really interesting thing about the Zahamena National Park is that the unique territory of its highland has paved the way for the development of several ecosystems that exist at the same time in this park. This is the reason why the types of wildlife living in one area are different in another, which makes it quite exciting to explore.

This protected area is divided into two parts, with a separate piece of land in the middle where many small villages are situated. These villages are inhabited (居住) by the members of the Sihanaka and Betsimisaraka ethnic groups.

The Zahamena National Park gets its name from the local Zahana Mena tree, an uncommon type of hardwood that grows in the lower regions of this protected area. It is characterized by its resilient (坚韧的) wood that can be rather challenging to cut, join, shape and carve even with modern tools.

Established as a strict natural highland reserve in 1927 (and one of the first of its kind in all of Madagascar), the Zahamena National Park was officially given its national park status (地位) in 1997 and was eventually opened to the public. Due to its remarkable territory and unique biodiversity, this national park was later listed as a key part of the collective UNESCO World Heritage Site called the Rainforests of the Atsinanana in 2007.

【推荐2】A new outdoor fabric (织物) stores energy by day and then lights up at night. Being tested in a city park, this totally “cool” fabric has attracted interest for its many urban uses.

This is the invention of Anai Green, an industrial and product designer based in Tel Aviv, Israel. She designed a fabric that includes organic and solar photovoltaic cells (光伏电池). The cells capture sunlight and store the energy in strips with LEDs. This allows the fabric to shade public space by day. When night falls, these strips light up. Green said, “We use LumiWeave to light public space without carbon emissions, making the lighting all-natural. And we spread light in the area we want to light only.”

The system was designed to adapt to all weather conditions and can continue to provide lighting even after three days without sunlight. In addition, you simply put LumiWeave up and the sun will do the work. This in itself saves 50 percent of the cost of building standard lighting, and it saves 100 percent on the electricity bills. This is great news for cities. Tel Aviv, Green’s hometown, is trying out LumiWeave in AtidimPark.

The mayor of Tel Aviv, Ron Huldai, is making efforts to address climate change. “LumiWeave will turn out to be a groundbreaking project,” Huldai said. The mayor added that LumiWeave is especially important as it solves the issue of shading urban areas and uses clean energy.

The new fabric can be fixed atop bike paths, in children’s parks and in walking areas. Many big cities in Israel are planning on adopting LumiWeave. As there is also use for the fabric in outdoor sitting areas of restaurants and hotels, Green has developed a LumiWeave parasol (大遮阳伞). “We are now developing the possibility of controlling it from the phone — we’re creating an application,” Green said. LumiWeave provides an ideal solution for urban parks and gardens. We hope that it will soon be lighting up night skies around the world.

【推荐3】Nowadays, body language has played a more and more important part in daily communication among people. To avoid confusion and embarrassment in cross-cultural communication, it’s necessary to have fluency in some common body language worldwide.

In Australia, it is very rude to wink (眨眼) at women.

In Brazil, pulling down the lower lid (眼睑) of the right eye means that the listener doesn’t believe what you’re saying. In India, holding your ear means either “honesty” or “I’m sorry”.

In Indonesia, hands on hips while talking means that you’re angry and it is also impolite.

In Japan, It’s unacceptable for two adults of the same sex to hold hands while walking together A smile can mean happiness, anger, or sadness. When someone praises you, respond by waving your hand back and forth in front of your face. Because it is considered impolite to show their teeth. women usually cover their mouths when they laugh. To make a promise, two people generally book their little fingers together.

In South Korea, when talking to someone, keep your hands in full view. It is rude to keep your hands behind your back or in your pockets.

In Spain, snapping the thumb and first finger together a few times is a form of applause. If you think the person you are talking about is mean, ta p your left elbow with your right hand. If you’ve heard the story that someone is telling before, put your right hand behind your head and pull your left ear.

In Sri Lanka, moving your head from side to side means “yes” and nodding your head up and down means “no”!

In Thailand, people point to an object with their chins, not their hands.

Have you learned the meanings of the above body languages in different countries? Keep these in mind and you’ll realize that they’re very helpful one day.