Why is the sky blue?
A few reasons, really: The sky is blue because of light wavelengths, because of angles, because of the Earth's atmosphere, and because your eyes tell you it is.
We have to start with white light first. As we all know from staring at the cover to Pink Floyd's The Dark Side of the Moon, white light isn’t really white; evidenced as it breaks up into its rainbow components whenever it passes through a prism. The sun's light is also white (despite our propensity to draw it as yellow), and therefore comprised of a rainbow (spectrum) of colors. One of those colors is, of course, blue.
Light moves in waves, and so do all the colors within it—each of which has a different wavelength: Red waves are long, blue waves are short. And light wavelengths will continue to travel in a direction until they encounter an obstacle. The Earth's atmosphere is a minefield of obstacles in the form of oxygen and nitrogen atoms. The short blue waves collide with these obstacles a lot easier than the longer-waved colors, and as they do so, they're scattered about the atmosphere.
And how do we see that color? You may remember that we have rods and cones in our eyes, millions of them. Rods deal with light and motion, cones deal with color. Non-colorblind people have cones set up to receive blue, green, and red. Any color that you can make from combining those three colours we can also see, although we have an easier time distinguishing blue. So between the high amount of blue scattering and our particular color vision, we see the sky as blue.
There’s *so much* rich, informative, exciting, inspiring, and well-written content here - where should I start?! By the way, and this isn’t pertinent to my question, I just had to stress again what a wealth of amazing content there is.Oh my goodness, thank you so much to the very real person that asked that question. Best place to start - fill out your profile. There’s a lot to do there, so don't attempt it all at once. Anything you're unfamiliar or unsure of, check out the specific page for that item and you can make an informed decision there. The more your profile is filled out, the better we can help you match with other people that share your passions and dreams.
What is the meaning of Life?The answer to this question is, of course, 42.
Beyond this, theGo encourages you to experience as much of life as you can. And while you’re at it, try to be nice and do good deeds.
I noticed that when I look at other people’s profile pictures, there’s something about me matching with them. Is this a dating site in disguise?!This is not a dating site in disguise. Your experiences, insofar as you’ve entered them, are compared to other people’s: The more you match, the higher the percentage you see. Of course, we think by virtue of you both being on this site, even at a 1.4% match, you’ll get along just fine.
We just want to show you—at a glance—who you have the most in common with. Having said that, if you find love on here and decide to get married, we DEMAND to be invited to your adventurous wedding.
Hello, I’m a notoriously grouchy person, so I have come to this site with considerable scepticism bordering on hostility, which leads me to my question: why am I here on this site when I could be watching cat videos or whatever?Here at theGo, we are huge fans of cat videos. Huge. We would never tell you not to watch a cat video. Cats try to act all regal and above it all, so it feels so good to watch them get taken down a peg. Or, when they try to balance on a peg, fall off that peg. But look, notoriously grouchy person, you’re here to share your life’s adventures and passions. And in return, other people will share theirs with you. What do cats share? Hairballs and dead mice.
Why can’t I comment on other people’s photos?You can’t comment on other people’s photos because we are still deciding on how we want comments to work on this site. We know as well as you do that elsewhere on the internet, comments sections bring out the absolute worst of humanity. And we would rather this site represent the best of humanity. When we figure out what commenting method will support that, we’ll happily add the functionality.
I’m in a very comfortable chair which has molded itself to the shape of my bottom. Why should I go anywhere or do anything since I won’t be as comfortable?Did you know that other countries also have chair technology? Some people don’t know that and that’s why they stay home. And yes, we realise that Google Earth is magical. But it’s the MOST magical to experience another place while standing IN that place. Or even while sat down on a comfortable chair in that place! It gives you perspective on where you live and makes you feel connected to an entire globe of people, all of whom seek to have a comfortable bottom.
How do planes not drop out of the sky?! They’re so big!It’s just our old friend physics, proving that math is actually useful for ONCE. Even if you don’t know much about physics, you probably know 3 things:
1) There was a guy named Newton, an apple dinged his head, and instead of eating it he figured out gravity
2) Newton made some laws of physics, especially the very relevant 3rd one that says, “For every action, there is an equal and opposite reaction”
3) Einstein had some crazy hair
Let’s look at that second point, Newton’s 3rd law. Planes are battling against two forces: Gravity pulling them down and air resistance (drag) pulling them back. To defeat the drag, like most cable news shows, plane’s engines blast out a constant stream of hot air, creating thrust and forward motion.
As for overcoming gravity, forward motion allows wings to produce lift. Wings may look flat, but they are slightly more curved on the top than the bottom, and tilted back slightly. Because of that shape/tilt, as air moves over and under the wings, it creates pockets of lower pressure above the wings and pushes them down against gravity, keeping the plane up in the air. If you want a more thorough explanation - with pictures, here you go!
Why doesn't this site display #hashtags?When hashtags were first created, they were a brilliant innovation that solved the problem of how to find relevant tweets, which crystallised around the use of #sandiegofire. It turns out that when you’re looking for information about a force of nature that could consume all your earthly possessions, you want that information fast. Of course, hashtags are still used this way, but increasingly they are used to make parenthetical statements or jokes, which are generally a waste of time and not funny #lifeistooshortformeaninglesshashtags #life #blessed.
That being said, theGo does allow you to tag your posts, fulfilling the hashtag’s original purpose of bringing like-minded people together, but hides the tags away, preventing hashtag abusers from inflicting hashtag misuse on others. #pleasetagresponsibly #yolo
Why do some countries drive on the wrong side of the road?The short answer according to this fascinating history is that almost everyone drove on the left to start with, back when driving involved *actual* horsepower: One hand on the reins, the other (usually right) hand on your sword. But over time, mainly due to politics or revolution, this changed. Now, 161 countries or territories drive on the right, with the other 75 driving on the left.
Most of the left-driving countries are remnants of the British empire. But just because you start off on one side, doesn’t mean you have to stay that way. Several times in the last hundred years, countries have entirely switched which side of the road their people drive on. Most recently, this happened in Fiji in 2009. One of the biggest happened in Sweden on September 3, 1967, on a day with a name that just rolls off the tongue: Högertrafikomläggningen. It’s fascinating to read about the logistical challenges involved, which you can do here on Wired.
How old is the Earth?About 4.54 billion years, give or take many millions of years.
How do we know? Radiometric dating. Some rocks contain radioactive elements, which decay over time and form new substances. Science people figured out how to measure these substances to determine any given rock’s age. They kept measuring until they found the oldest rocks on Earth (in Western Australia).
The Earth will potentially be around for another 4ish billion years, at which point the Sun will begin its long process of dying off. As part of that dying off process, it will get even hotter, burning away all life on earth. Even if Earthlings figured out how to block that heat, the sun will actually grow so large it will engulf the earth completely. But hey, don’t worry about it, all humans will be long extinct by then anyway.