Most people know precious gemstones (宝石) by their appearances. An emerald flashes deep green, a ruby seems to hold a red fire inside, and a diamond shines like a star. It's more difficult to tell where the gem was mined, since a diamond from Australia or Arkansas may appear the same to one from the Democratic Republic of the Congo. However, recently, a team of scientists has found a way to identify a gemstone's origin.

    Beneath the surface of a gemstone, on the tiny level of atoms and molecules（分子）, lie clues (线索) to its origin. At this year's meeting of the Geological Society of America in Minneapolis, Catherine McManus reported on a technique that uses lasers (激光) to clarify these clues and identify a stone's homeland. McManus directs scientific research at Materialytics, in Killeen, Texas. The company is developing the technique. “With enough data, we could identify which country, which mining place, even the individual mine a gemstone comes from,” McManus told Science News.

    Some gemstones, including many diamonds, come from war-torn countries. Sales of those “blood minerals” may encourage violent civil wars where innocent people are injured or killed. In an effort to reduce the trade in blood minerals, the U.S. government passed law in July 2010 that requires companies that sell gemstones to determine the origins of their stones.

    To figure out where gemstones come from, McManus and her team focus a powerful laser on a small sample of the gemstone. The technique is called laser-induced breakdown spectroscopy. Just as heat can turn ice into water or water into steam, energy from the laser changes the state of matter of the stone. The laser changes a miniscule part of the gemstone into plasma, a gas state of matter in which tiny particles（微粒）called electrons separate from atoms.

    The plasma, which is superhot, produces a light pattern. (The science of analyzing this kind of light pattern is called spectroscopy.) Different elements produce different patterns, but McManus and her team say that gemstones from the same area produce similar patterns. Materialytics has already collected patterns from thousands of gemstones, including more than 200 from diamonds. They can compare the light pattern from an unknown gemstone to patterns they do know and look for a match. The light pattern acts like a signature, telling the researchers the origin of the gemstone.

    In a small test, the laser technique correctly identified the origins of 95 out of every 100 diamonds. For gemstones like emeralds and rubies, the technique proved successful for 98 out of every 100 stones. The scientists need to collect and analyze more samples, including those from war-torn countries, before the tool is ready for commercial use.

    Scientists like Barbara Dutrow, a mineralogist from Louisiana State University in Baton Rouge, find the technique exciting. “This is a basic new tool that could provide a better fingerprint of a material from a particular locality,” she told Science News.

Worlds of Fun

    Location: Worlds of Fun is located off Highway 435 in Kansas City, Missouri.

History: Worlds of Fun was opened on May 26, 1973, at a cost of 25 million dollars, which was founded by Hunt Midwest Company. In 1982, Hunt Midwest bought a nearby water park，Oceans of Fun, In 2013, Worlds of Fun and Oceans of Fun were combined to a one ticket admission, providing all guests with 235 acres of amusement and water rides.

Hours: Worlds of Fun is open from April through Halloween.

Tickets: Buy and print online. Always try to buy your tickets in advance, to save time when you get to the park.

Reservations: Worlds of Fun sells “Fast Lane” cards that save riders' time by allowing them to bypass the majority of wait for most of rides and attractions. Ride as many times as you want all day long.

Strategy (策略): Most visitors tend to begin the day with Prowler, the hottest attraction in the park. However, you'd better use that trend and head to the Patriot first. After that, try the Dragons. Then work your way back to the Prowler. After riding the Prowler, there is only one coaster left, Mamba. Hit it next. If the park is not very crowded, you can ride Boomerang on the way to Mamba. After riding Mamba, head back for a ride on the Wolf. By then you will have tried most of the popular rides and attractions in the shortest possible time.

News: In 2017, Worlds of Fun is adding Steel Hawk, a ride that will take guests up 301 feet in the air and spin (旋转) them at a 45-degree angle for a 60-second flight. Wait to have a try!

    Toronto is reminding citizens this month what exactly can and can't go into the blue bins an you may be surprised at what can't be recycled. As it turns out the takeout coffee cups you've been throwing into the recycling actually have to go in the garbage.

    The city's “recycle right” web explains that food left after a meal, woven (编织的) cloth, old VHS tapes and other things have been turning up in blue bins, where they don't belong.

    According to the city, about 45,000 tunes of garbage was mistakenly put into recycling bins last year alone.

    Among those things are the takeout coffee and tea cups we get while were on the go. The city says that because those paper cups are lined with plastic or wax they can't be recycled. The black plastic coffee lids (盖子) also can't go in the blue bin, although non-black plastic lids can be recycled.

    Emily Alfred, senior campaigner with the Toronto Environmental Alliance, said, “Millions of cups are used in Toronto every year and people are taking these out and putting them in the wrong bin.”

    When paper coffee cups are thrown in with the recycling. Alfred said, they produce a harmful effect on the system.

    “They can't separate the plastic and paper in a typical paper recycling center,” Alfred said, “so it just causes pollution of the recycling process, and it causes lower-quality paper if it does get recycled.”

    “New regulations passed last month call for changes to be rolled out over the next few years regarding what products companies can sell,” Alfred said. Her organization will be pushing for more producer responsibility laws, which call on companies that design and make products to take on the responsibility of recycling them.

    For now, consumers can consider carrying their own reusable coffee cups while they are on the go, ask for a ceramic mug (陶瓷杯) if they plan to consume their drink in the cafe, and support their local government officials if they have put efforts into changing recycling or producer responsibility laws.

    Alfred said, “I think people can change their habits easily if they understand what to do.”

    Everyone who has eaten instant noodles knows that it's very easy to cook them quickly. However, have you ever heard of the danger of eating them?

    When taking out the noodles from the packaging, you will notice that they are joined together nicely as a piece. Do you know that it needs some form of wax coating (蜡涂层) to make them joined together nicely? Many people don't really care much about it because this seems very normal. However, studies have shown that the wax coating is bad for our body.

    It is advisable to have a break of 2-3 days before we start to eat another packet of instant noodles because our body needs about 3 days to clear that wax coating away. Do you know the danger of having too much wax coating in our stomach? It will lead to cancer if it is in our body for so long.

    Luckily, there is a way of reducing the danger before we eat instant noodles. First, wash the noodles with warm water, stir (搅拌) them and pour away the water containing the wax coating. Then repeat the first step and try to stir them again to wash away the wax coating on the noodles before cooking them. The shop vendors (供应商) will often wash away the dangerous wax coating.

    It is very easy to cook instant noodles but we must pay attention to the wax coating if we eat too much. Imagine having too much of it in your stomach. Oh, my! Hope this article will help more people know about the hidden danger!

    Elizabeth Blackwell was born in England in 1821, and moved to New York City when she was ten years old. One day she decided that she wanted to become a doctor. That was nearly impossible for a woman in the middle of the nineteenth century. After writing many letters asking for admission(录取) to medical schools, she was finally accepted by a doctor in Philadelphia. She was so determined that she taught school and gave music lessons to get money for the cost of schooling.

    In 1849, after graduation from medical school, she decided to further her education in Paris. She wanted to be a surgeon(外科医师), but a serious eye problem forced her to give up the idea.

    Upon returning to the United States, she found it difficult to start her own practice because she was a woman. By 1857 Elizabeth and her sister, also a doctor, along with another woman doctor, managed to open a new hospital, the first for women and children Besides being the first woman physician and founding her own hospital, she also set up the first medical school for women.

On August 1, 2023, new rules went into effect in the United States thạt make it against the law to sell most incandescent (白炽的) light bulbs.

Incandescent light bulbs have been common since the late 1800s. They use electricity to create light by heating a metal wire, which glows. Over 90% of the electricity used by the bulbs goes into making heat — not light.

Since 2005, countries around the world have been banning incandescent bulbs. That's what's happening in the US. The new rules don't actually make incandescent bulbs illegal. They just say that light bulbs that are sold must be able to create a certain amount of light (45 lumens) with a certain amount of energy (l watt). Most incandescent bulbs can only create about 15 lumen s with I watt.

These days, the best way to replace incandescent bulbs is with LED light bulbs. These bulbs can create about 75 lumens with 1 watt of electricity. And they can last 25 or more times longer than incandescent bulbs.

Though the rule just took effect at the beginning of August, it was first created in 2007. Since then, the rule has been delayed many times, usually for political reasons. In the early 2000s, LED bulbs cost more money than they do today, and weren't nearly as good. But in recent years, people have been switching over to LED lights, even without the rule. The lights have become more and more popular, since they use less energy and save people money by lasting longer.

The new rules will also help the environment. Over the next 30 years, LED bulbs are expected to help prevent a huge amount of pollution in the US — about as much as would be used by 28 million homes in one year. That will be an imperative step in tackling the climate crisis.