مستوى متوسط

Forty-seven years ago, on April 22, 1970, twenty million Americans took to the streets to voice their concern about the deteriorating environment and urge the government to take action before it was too late. The grassroots movement, which is now celebrated by over 2 billion people in 192 countries, led to the enactment of numerous environmental laws, including the Clean Air Act of 1970 and the Endangered Species Act of 1973....

Space travel is expensive, especially since every launch requires a new rocket. The biggest and most costly part is the booster that powers the spacecraft beyond the Earth’s orbit. Once the job, which takes a few minutes, is completed, it separates from the rest of the rocket and drops back into the ocean while the second stage engine takes over and delivers the payload to its destination....

Easter, which will be celebrated on Sunday, April 16 this year, offers many fun activities. But the one all kids look forward to the most is the egg hunt. However, in 2005 U.S. Bureau of Alcohol, Tobacco, and Firearms (ATF) special agent David Hyche realized that visually impaired children like his then 19-month-old daughter, Rachel, were unable to participate in this exciting event....

Given that more than 65% of infectious diseases that affect humans originate from other animals, the most logical way to stop them would be to locate the source. However, studying wildlife for clues about the origin of the next epidemic is like looking for a needle in a haystack. As a result, scientists and health officials are forced to combat illnesses like the recent Zika Virus, after they spread....

With our smart gadgets continuing to get increasingly powerful, battery power, of all things, is becoming of utmost importance. But amid the messy tangle of smartphone cords, unwieldy portable chargers, and the improbability of finding an electrical outlet, charging remains a challenge. Now, some brilliant scientists at Disney Research have created a room that can wirelessly charge all your electronic devices simultaneously....

Like most people, Gal Rozov hates folding laundry. But instead of complaining, the software developer decided to put his programming skills to work and create a laundry-folding robot! In 2012, after spending two years researching the most efficient design, Rozov moved from Israel to California and founded FoldiMate Inc. It took another four years, but by 2016, he had a working prototype of the namesake robot....

On June 23, 2016, the residents of the United Kingdom (UK) shocked the world by voting for the country’s exit from the European Union (EU), or “Brexit.” On March 29, almost nine months after the historic referendum, the country’s Prime Minister, Theresa May, began the official separation process with a letter to EU President Donald Tusk. It urged the remaining member states to allow the UK to leave “in a fair and orderly manner, and with as little disruption as possible on each side.”...

While the fact that Julia is “Sesame Street’s” first new Muppet in a decade is certainly newsworthy, that is not the only thing that makes her special. The cheery, green-eyed 4-year-old who has autism is also here to expose young kids to children with autistic traits and teach them about acceptance....

Like the rest of their species, the Southern Hemisphere humpbacks, or Megaptera novaeangliae, are not social animals. The baleen whales typically prefer to remain solo or amalgamate in small groups which disperse quickly. However, since 2011, researchers from the Cape Peninsula University of Technology in Cape Town have been observing a new phenomenon off the coast of South Africa — large swarms of whales, comprising anywhere from 20 to 200 individuals. Professor Ken Findlay and his team reported seeing 22 instances of the large groups on three different occasions in 2011, 2014, and 2015....

Always wanted to help fight climate change? Then join the Earth Hour party on Saturday, March 25 by turning off all lights from 8:30 — 9:30 PM local time. This small action, taken by hundreds of millions of people around the world, will make a dent in our efforts to reverse global warming. More importantly, it will demonstrate what can be achieved if we all unite to protect our planet....

As most people age, the crystalline lenses in their eyes start to stiffen and are unable to change shape as easily. As a result, objects in close range start to look blurry, forcing many middle-aged adults to carry reading glasses either around their necks or tucked away in a handbag. Those already suffering from nearsightedness, or myopia, a condition where distant objects appear blurry, have to depend on bifocals or, even worse, switch between two pairs of glasses. However, thanks to some Utah researchers there may finally be a solution — self-adjusting “smart” glasses....

Residents of the US East Coast still recovering from last week’s record snowstorms will be happy to know that today is not just the first day of spring, but also the International Day of Happiness. First celebrated in 2013, this fun holiday was established by the United Nations (UN) to remind us that "the pursuit of happiness is a fundamental human goal."...

With its wide canopy of leaves, the majestic 50-feet tall manchineel tree that is native to the Caribbean, Florida, the northern coast of South America, Central America, and the Bahamas, looks particularly inviting, especially on a hot summer day. But you may be wise to heed the warning signs given that the deceptively innocuous tree holds the Guinness World Record for “the world’s most dangerous tree.”...

If some geologists have their way, world maps will soon be altered to reflect an eighth continent. Dubbed “Zealandia,” the landmass that lies east of Australia covers 1.9 million mi2 (4.9 million km2), or an area larger than the Indian subcontinent. The only catch? Over 94 percent of it is submerged in the southwest Pacific Ocean, with just the islands of New Zealand and New Caledonia, visible above sea level....

Every year on March 17, millions of people worldwide celebrate St. Patrick’s Day by participating in parades, wearing green, and searching for leprechauns in the hopes of finding gold. So who was this clergyman whose death anniversary is celebrated with such gusto, and how did the fun traditions associated with the holiday begin? Read on....

The phrase “good things come in small packages” certainly appears to hold true when it comes to ants. The tiny creatures can survive floods by morphing into rafts, find their way home using an internalized GPS system, and even lift up to 20 times their body weight. In 2013, scientists discovered that the insects, whose brains are smaller than a quarter of a small pin’s head, could even use tools, a skill that was once believed to be the realm of “intelligent” species like humans and a select number of animals. Now, researchers from the University of Szeged in Hungary have discovered that when given a choice, the clever insects even have the smarts to select the most efficient tool for the job....

Even if math doesn’t rank high on your list of favorite subjects, chances are you still look forward to Pi Day. That’s because though the discussions may begin with Pi — the ratio of the circumference of a circle to its diameter — they invariably end with a piece or two of yummy pie! The event is commemorated on March 14 because though the irrational number (its decimal representation never ends and never repeats) has been calculated to over ten trillion digits, it is widely recognized as 3.14....

In August 2013, billionaire entrepreneur Elon Musk released a 57-page white paper concept for Hyperloop — a supersonic mass transit system between high-traffic cities that lie within short distances. The founder of Tesla Motors and SpaceX envisioned it to be a frictionless system where pods inside low-pressure, vacuum-sealed tubes would transport passengers and cargo at up to 760 miles an hour — approximately the speed of sound. Powered by solar energy, it would be strong enough to withstand extreme weather and earthquakes....

Holi, the spring festival of colors that will be celebrated on Sunday, March 12, is one of India’s most anticipated events. Observed annually on the last full moon day of the Hindu calendar month of Phalguna, the two-day holiday entails taking to the streets early in the morning to douse strangers and friend alike, with colored powder and water. However, unlike the copycat color runs in the US, revelers do not have to race five or ten kilometers to participate!...

After a relatively calm 2016, Europe’s most active volcano — Mount Etna in Sicily, Italy — came to life on February 27. The eruption that occurred at about 6:00 pm local time from the relatively new Southeast Crater formed by a 1978 eruption lit up the dark Sicilian skies with fountains of bright orange lava. As is characteristic of all Mount Etna ejections, the lava stream was accompanied by Strombolian eruptions. The short-lived, explosive outbursts that are caused by trapped bubbles of gas escaping through the lava can reach heights of several hundred meters, making for a spectacular show....

On Sunday, March 12, most Americans will ‘lose’ an hour by moving their clocks forward sixty minutes. This small sacrifice that marks the start of Daylight Saving Time (DST) is designed to allow residents to enjoy longer days during the upcoming spring and summer months....

On February 21, after a week of feasting on her favorite treats that included a multi-tiered ice cake, giant panda Bao Bao started preparing for her one-way journey to China. The National Zoo resident began the morning with a hearty breakfast comprising 17 pounds (8 kg) of bamboo and 5.4 pounds (2.4 kg) of leafeater biscuits before heading out for some fresh air. Shortly after, she was put inside a custom-made, four-by-six, steel travel crate and transported to the Washington Dulles International Airport....

The steady increase in global temperatures has been particularly disastrous for the polar ice caps. Experts warn that if this trend continues, there will be no late summer ice in the Arctic region by the 2030’s. The most effective solution, of course, is to reduce our greenhouse gas emissions before it’s too late. But since that is not happening, scientists are frantically trying to come up with alternative ways to try to reverse the situation....

Winter means different things to different people. For some, it is the chance to cozy up to a warm fire, for others, a time to frolic in the snow. Then there are those that head to the Takhini Hot Springs in Yukon, Canada to participate in the wacky and hilarious International Hair Freezing Contest....