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NASA satellite images: Which are the most polluted countries in the world?

<b>(CNN) —</b> The United States and Europe are among the world's largest emitters of nitrogen dioxide -- but both have also shown the most dramatic reductions in these emissions between 2005 and 2014, according to new global NASA satellite maps.<p>Nitrogen dioxide is a yellow-brown gas that is a common …

Pollution

Neil DeGrasse Tyson's best quotes may make you fall in love with science all over again

But deGrasse Tyson also has a serious side, which he reveals time and again in his books, shows, Twitter page, and popular science articles.<p>Often, deGrasse Tyson's humor strikes a serious chord that not only makes us laugh but also think. As a popular science educator, deGrasse Tyson is out to …

Scientists think they just found the most important planet outside our solar system

A small planet, just a bit bigger than Earth, has been spotted in our stellar neighborhood, just 39 light-years away.<p>Known as GJ 1132b, it is the closest rocky exoplanet to have ever been found, and astronomers say it could provide our most in-depth look yet at an alien world not so different than …

Universe

Why knuckle cracking makes a popping sound, and why it might be beneficial

When muscle joints are pulled apart there forms a tiny cavity filled with gas which then collapses, creating a popping noise.<p>The wince-inducing sound of knuckles cracking is caused by a small bubble building up in the fluid of the fingers then ‘popping ‘, scientists believe, and it could even be …

Research

7 Simple Maintenance and Care Tips to Keep Your Digital Camera in Great Shape

Camera bodies, lenses and accessories are significant investments that require care. They start the day with us at sunrise, finish at sunsets and …

Landscape Photography

4 Wildlife Photography Tips to Add a Wow Factor to Your Wildlife Shots

When photographing wildlife, we typically have a few seconds to ‘get the shot' of that bird, bear, deer, common or rare animal. Our beautiful …

Science Is Beautiful: The Human Body Under The Microscope

A new book showcases the magnificent micro-world<p><i>Science Is Beautiful</i>, a new book by Colin Salter, is a compilation of images that show what the human body looks like under a microscope. With an artistic eye, the book showcases cells, microbes, and more. Here are some of our favorite images from</i> …

E.coli

Backers of the 2024 Boston Summer Olympics shared details about the presentation pitched to the United State Olympic Committee in California in December.

Olympics Supporters Share Preliminary Details of 2024 Bid Proposal<p>The plan would split the games up into "clusters" spanning from the waterfront to …

Neil deGrasse Tyson Thoughtfully Answered A Six-Year-Old Boy’s Impossible Question

There are some questions humans will never be able to answer. Where do babies come from? How did <i>According to Jim</i> air for eight seasons? What’s the meaning of life? That last one is particularly impossible, though astromemeicist Neil deGrasse Tyson gave it a shot when a …

Mystery ‘alien’ radio signal picked up in space

Radio waves in space could be evaporating black holes, alien communication or merging neutron stars<p>A mysterious radio signal which may have come from a black hole, a neutron star or even an alien civilisation, has been picked up by astronomers.<p>Fast radio bursts, which last only milliseconds, are …

Universe

Genetic Megaproject Traces the Evolutionary ‘Big Bang’ for Birds

The demise of the dinosaurs touched off an evolutionary “big bang” that lasted 15 million years or less and gave rise to all the types of birds we see today, according to the findings from a massive research effort involving hundreds of researchers from 20 countries.<p>Over the course of more than …

Paleontology

Photos of Retired Subway Cars Being Dumped Into the Atlantic Ocean

Ever wonder what happens to subway cars after they’re decommissioned? For cars owned by the Metropolitan Transit Authority, they’re dropped into the …

A Black Panther May Not Be What You Think

As the superhero of the same name sets box-office records, learn more about the misunderstood big cats.<p>As theatergoers around the world marvel at the new superhero movie <i>Black Panther</i>, we here at National Geographic wanted to share some facts about these real-life fascinating felines.<p>First things …

Why the modern world is bad for your brain

In an era of email, text messages, Facebook and Twitter, we’re all required to do several things at once. But this constant multitasking is taking its toll. Here neuroscientist Daniel J Levitin explains how our addiction to technology is making us less efficient<p>Daniel J Levitin Q&A<p>Our brains are …

Productivity

The Dos and Don'ts of LinkedIn

Because, really, what ARE the rules?<p>You rely on LinkedIn a lot, right? Us too, but here's an arresting professional thought: We're doing it wrong.<p>Like, <i>are</i> you supposed to accept all the invitations you get, or does that mess with the algorithm of your network (or something)? Is there a way to …

Is poker a game of skill, or a game of luck?

Last week, researchers claimed to have developed a poker-playing computer program that is nearly unbeatable. What are the implications for the old debate about whether poker is a game of skill or luck?<p>As a spectator sport, poker traditionally isn’t the most engaging thing to watch. I realised this …

Artificial Intelligence

异国蔬菜故乡味

来自厨友 “verita” 投稿( 她的下厨房主页 )<p>在国外久了,对于吃的执念好像很大程度上等于了对生活的热情。乍一看来,美国的食物实在是乏善可陈,然而细细寻觅,却也有不少惊喜值得尝试。下厨三年,虽然技艺提高有限,在开发新食材,尤其是美国超市怪蔬菜的道路上却越走越远,当然,是迫于见不到顶花带刺的黄瓜 …

Neil deGrasse Tyson Selects the Eight Books Every Intelligent Person on the Planet Should Read

In December of 2011, <b>Neil deGrasse Tyson</b> — champion of science, celebrator of the cosmic perspective, master of the soundbite — participated in Reddit’s Ask Me Anything series of public questions and answers. One reader posed the following question: <i>“Which books should be read by every single</i> …

The 12 most important moments in science in 2014

Virgin Galactic’s Spaceship Two crashed – and then, 300m miles away, Philae landed on a comet. From the distant origins of humans to our future on the planet, 12 leading scientists pick their key moments and stories of the year<p>1 The West Antarctic ice sheet enters irreversible decline<p><b>13 January</b><p>In …

I Walked Into Abercrombie And Saw Everything That's Wrong With The Brand

The once-leading teen retailer has struggled to stay relevant since the surge in demand for fast-fashion brands like Forever 21 and H&M.<p>Abercrombie has also been criticized for excluding plus-size customers and minorities in its stores.<p>For several months, Abercrombie has been touting a rebrand that …

Dinosaurs Had Feathers Long Before Any Could Fly, And Now Scientists Know Why

Why did dinosaurs have feathers millions of years before the first reptiles took to the air?<p>Paleontologists have been puzzling over that question for years. But now an answer may finally be at hand, thanks to a fascinating new study by researchers at the University of Bonn in Germany.<p>“Until now, …