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The Scandinavians call them mother of pearls because of their spectacular iridescent colors. For comparison, some of the highest clouds in the troposphere have a ceiling height of about 40,000 feet. Clouds generally do not form in the stratosphere because there is not enough moisture. But nacreous clouds are different. Decades ago, we started using substances such as chlorofluorocarbons (CFCs) in aerosols and refrigeration. These chemicals have been phased out, but they are so stable they persist to this date....

As soon as I was able to run, I wanted to run faster. Im no Olympian, but Im fast enough to occasionally win age group medals at local races. But first, I want to be clear about something: itdoesnt actually matter how slow you run. At any speed, there will always be someone faster than you and someone slower than you. I knew that, even at the beginning, but I still wanted to be better thanmyself....

For high-achievers, striving to be the best is part of the job description. Pushing your limits can be exhilarating, accomplishing things youve set your sights on can be motivating. This post originally appeared onThe Muse. If your careers important to you, you also know that making your dreams a reality requires sacrifice. Trading quality time with loved ones for long hours at the office becomes the norm. Finding the rightwork-life balanceis a struggle that every ambitious person faces....

Spirit Airlinesgets a lot of crap. Most of the time,that crap is well deserved. The problem is, their prices are enticingly low. Its possible, however, to fly this cheap, unaccommodating airline without losing your mind. As much as people hate Spirit, you have to admit: their prices are awesome. Even better, its a nonstop flight thats a few hours long. Its not the first time Ive flown with Spirit, either....

Like previous years, its a mess. Lets run down your other options. Twitter will also have pre-game Periscope broadcasts and in-game highlights. Both will give you access to NFL games this season. Unfortunately, channel availability complicates things a bit. Sling TVs top-tier $40/month Orange+Blue planis the one you want. It comes with Fox, NBC, ESPN, and the NFL data pipe. CBS, however, isnoton Sling TV, so you cant stream games that air on CBS, sadly....

The Japanese rail connection is known throughout the world for its superiority and punctuality. Of these, 22% or 8.7 million take the subway. The Tokyo subway web connection is a transportation marvel. Thats about 24 trains per hour going in one direction. These white glove-wearing personal actually pushes people into the train, so the doors can be shut. This is so surreal, it has to be seen to be believed....

Its probably safe to assume no ones ever gotten rich clipping coupons. That doesnt mean saving money is a waste of time, though. Some money-saving habits are worthwhile and save you aheap of cash in the long run. Others just arent worth it. Here are somespecific habits Ive ditchedbecause they arent worth my time and energy (or yours). For me, it didnt. Lets look at the math. The math adds up, but it lacks common sense....

HDR is the latest trend in display technology and its here to stay. HDR TVs are designed to create a more realistic picture by representing colors in a more lifelike way. HDR TVs would have closer to 1,000. That brightness, orluminance, for each color is measured in nits, orcandela per square meter. In short, HDR really makes bright colors pop and keeps dark colors dark. Because its an open standard, content creators can use it without paying licensing fees....

The largest measures about 115 meters across. These rocks are estimated to have struck the surface at 14,400 kilometers an hour. Photo credit:Valmice Vieira/Panoramio Before entering the atmosphere the asteroid probably weighed 600 tons. It is the second heaviest single-piece meteorite recovered on Earth, after the Hoba meteorite. There are thousands of tiny pieces of meteorites all over the region. Its illegal to remove them, but thefts continue to occur all the same....

In the early 1960s, the Soviet Union was way ahead of the United States in the space race. Indeed, plans for a monument had begun three years before Yuri Gagarin even left earth. At its apex is a rocket. The monument is 110 meters tall, and leans on to one side at an angle of 77. It is cladded by a suit of titanium a metal of high tensile strength and high resistance to corrosion....

Your environment has an incredible ability to shape your behavior. This post originally appeared onJamesClear.com. Keep in mind, these ideas are just a start. Many of the ideas below come from his popular book,Mindless Eating(audiobook). Use smaller plates.Bigger plates mean bigger portions. And that means you eat more. The picture below explains why. When you eat a small portion off of a large plate, your mind feels unsatisfied. Meanwhile, the same portion will feel more filling when eaten off of a small plate....

This post originally appeared on theHelp Scout blog. Sure, there are tons of productivity hacks out therefrom to-do lists to time-management apps to mindfulness exercises. Everything seems to work for at least a short while, until the suck of everyday demands takes over. To start, lets think about some crucial turning points in the day. Typically, we have a window of about three hours where were really, really focused. Studies have shown we experience a decrease in cognitive functioning from morning to afternoon....

They have a lot of similarities, but both games bring something very different to the table. They may seem like fierce competitors, but they have a lot in common. Pathfinder Roleplaying Game:Pathfinderis also a fantasy-based tabletop roleplaying game that is remarkably similar toD&D. And thats a good thing because they each cater to different types of players. D&Ds vagueness can also be detrimental for some players, though. Its rule set is simpler, but it also offers a lot less of the customization and complexity thatPathfinderdoes....