There are a few things in this world that we can always rely on as constants: The sun will always rise each morning, the seasons will always change and time will inevitably march forward at its predictable clip. Except the sun doesn't actually rise, seasons are disappearing and time ... well, see, time is tricky, too.
For example ...
#7. We May Not Live in the Present
What if we told you that what you think of as "the present" is actually slightly in the past? Basically, your life isn't a live feed: It's a delayed broadcast that your brain is constantly editing and censoring for your convenience.
The delay isn't much -- what's 80 milliseconds between you and your brain? Nothing, right? Well, a group of neuroscientists disagree. They've come up with some freaky time-altering experiments to prove that this difference can change your perspective of cause and effect. For example, in one experiment the volunteers were told to press a button that would cause a light to flash, with a short delay. After 10 or so tries, the volunteers were beginning to see the flash immediately after they pressed the button -- their brains had gotten used to the delay and decided to edit it out. Yes, that's a thing your brain can do.
"Being a brain is kind of boring, but we've got lots of time for pranks."
But that's not the freaky part. When the scientists removed the delay, the volunteers reported seeing the flash before they pressed the button. Their brains, in trying to reconstruct the events, messed up and switched the order. They were seeing the consequence first and the action second.
"You really don't want to see the copies."
Not convinced? Try this: Touch your nose and your toe at the same time. Logic says that you should feel your nose first, because it's right there in your face (hopefully) and therefore the sensory signal doesn't have to travel too long before reaching the brain, whereas your toe is at the extreme opposite end. The physical distance a message has to travel on neurological pathways is much longer from toes than from nose, and yet you feel both things at the same time. According to neuroscientist David Eagleman, that's because your brain always tries to synchronize the sensory information that it gets from your body in a way that will make sense to you, but it can only do that by pushing your consciousness slightly into the past, like a radio station that's always on a five-second delay in case somebody curses on air.
The bizarre real-world implication is that the taller you are, the further back you live in the past, since it takes longer for the information to travel through your body -- and if you're a little person, you live closer to the present.
The shortened reflex time gives them an enormous advantage at bull fighting.
But we're only talking about our perception of time here. It's not like time itself can actually slow down or speed up in reality ... right?
#6. The Higher You Live, the Faster You Age
If you want to experience a real time warp, simply walk up some stairs. It turns out that time isn't the same all over -- it actually runs faster in higher places. In a recent experiment, scientists placed two atomic clocks on two tables, then raised one of the tables by 33 centimeters ... and found out that the higher clock was running faster than the lower one at a rate of a 90-billionth of a second in 79 years.
"Timmy, you get down from there before you get cataracts!"
These are the most precise clocks ever made, and the only difference between them was their distance from the Earth. That means people who live in higher places age slightly faster than people at the ground level. So for anyone keeping score, that's giant people 0, dwarfs 2.
This is called time dilation, and it happens because (as Einstein's theory of relativity predicted) gravity warps time as well as space. The closer you are to the ground, the more you are affected by the Earth's gravity and the slower time moves. On the other hand, as you get higher, gravity's pull weakens and time speeds up.
"Finally! First thing I'm doing is moving away from Colorado."
Keep in mind that this is an insignificant amount of time we're talking about here. It has absolutely no bearing on your life -- unless you rely on GPS equipment, that is. Because a clock inside a GPS satellite runs at 38 microseconds per day faster than the same clock would run on Earth, a computer has to constantly adjust everything to make up for that difference. Otherwise the consequences would be disastrous: In only one day, the entire system would be off by 10 kilometers, and it would just get worse from then on.
"You have arrived in Calgary. Probably."
Oh, and by the way, gravity isn't the only thing that can mess up time ...
#5. The Faster You Go, the Slower Time Moves
Another thing GPS satellites have to take into account is speed: The faster you travel, the slower time moves. Now you almost certainly knew that already, thanks to Einstein -- if you're going the speed of light, time pretty much stops. But it turns out that you don't need an ultra fast spaceship to slow down time -- your shitty car will do.
Seriously, man, just let it go. It's time to move on.
Using the extremely precise atomic clocks we just mentioned, scientists have proven that the same thing happens to you every day, on a much smaller scale. Making one of the clocks move at only 36 kilometers per hour (around 20 mph) caused it to slow down its tick by almost 6 x 10-16. In numbers we can understand, that translates to "Not a whole lot, but still, holy shit, you guys."
So, let's say you're driving to work at around 40 mph -- that right there is apparently enough to cause time to move 0.0000000000000002 percent slower than it would if you were standing still.
And, no, that doesn't explain the actions of the asshole in front of you.
In another experiment, one atomic clock was taken on a plane trip around the world while the other one stayed home (admit it -- if you had an atomic clock, you'd constantly be thinking up shit like this). Even though the clocks were perfectly synchronized at first, the traveling clock came back from its 50-hour, 800-kilometer trip missing 230 or so nanoseconds.
And it transformed into a beautiful, majestic moose.
So the clock gained time from being farther from the Earth than the other one, but it lost even more just by going faster. What's even weirder is that from the perspective of the clock on the plane, the clock back home is the one that's running faster than normal. You don't actually feel time slowing down or speeding up: Only someone outside your conditions can tell the difference. And that leads us a little further down this rabbit hole ...
#4. Time Doesn't Run at the Same Speed for Everyone
A trippy consequence of the stuff we just explained is that, apparently, different people can witness the same events happening at different speeds. Einstein claimed that events that appear simultaneous to a person in motion may not look simultaneous to someone who is standing still. So reality may actually be a mess of people walking around in slightly different timelines that sometimes synch up or intersect, depending on their conditions. This would help explain why everyone from Cream looks like a mummy now except for Eric Clapton.
And why he's dressing as if he thinks it's still 1978.
Neuroscientist Warren Meck conducted studies to prove that brain time is relative. In one experiment, he trained lab rats to push a small lever after a certain period of time -- and found out that the exact same interval could be timed differently depending on the rats' conditions. This means that 10 seconds can sometimes seem like 30 seconds, and 30 seconds can sometimes seem like 90 seconds, and so on. But you didn't need lab rats to know that: Surely you've been cornered at parties by someone who wants to tell you what really happened on 9/11.
Well, according to Meck, this happens because there isn't a single "clock" that tells the time in our brains: There are multiple brain clocks, all running at different speeds. So basically, the guy in the speeding train, the guy way up in the GPS satellite and the guy at the party working out an exit strategy all coexist inside our heads and our brain decides which one to believe at any given time.
"It's been six minutes. Man, science is a dick."
There are lots of other things that can alter our perception of time, like drugs, mental disorders, old age or even distance. With all these variables, time is constantly in flux for everyone. So the next time you're late for something, just lay that nugget of truth on anyone waiting for you. They may think you're an asshole, but at least it won't be for your tardiness.