Tag: Shocking fact

Choosing Super Facts

This is my 100th post on my Superfactful blog. There are 50 super-fact posts. The other posts are posts about the blog, like this one, or posts featuring interesting information that I think is important, or book reviews of non-fiction books, travel posts with some information, posts about me, or mysteries.

However, the goal of this blog is to create a long list of facts that are important, not trivia, and that are known to be true and yet are either disputed by large segments of the public or highly surprising or misunderstood by many, perhaps shocking. Learning or accepting such a fact will change how you view the world. This makes these facts deserving of special attention, which is why I refer to them as super facts. You can also consider the super facts as a form of myth busting, major myth busting.

As mentioned, at the time of writing this I have come up with 50 super facts and made 50 posts about those super facts, but I am hoping to come up with hundreds. I am open to suggestions for super facts as well as critique of super facts. Tell me if you think it is trivia, not important, not surprising, or not an established fact. To see the first 50 super facts click here.

A blue brain is splitting up into pieces | Choosing Super Facts
Smash your old beliefs with new surprising facts, super facts. Expand your mind. Shutterstock ID: 1685660680 by MattL_Images

Deciding on What is an Important Fact

Deciding what is an important fact or not is subjective, but for the same reason it also makes it an easy thing to decide. Ultimately, I decide what is important. It is difficult to compare the importance of facts, but my main concern is to avoid trivia. I also try to avoid facts that may be important to me but do not concern others very much.

For example, I am looking for facts that people discuss a lot, or are often mentioned in the mainstream media, or facts that people dispute fiercely despite a scientific consensus and overwhelming evidence telling us what is true. I am looking for facts from science that could change people’s perspective on nature, our world, or the universe, or facts that could change people’s view of the world, that are related to important historical events, such as the deaths of millions of people, etc.

Shocking Facts

Deciding whether a fact is highly surprising, misunderstood by many, shocking, or contentious and disputed is also not an exact science. In some cases, there are polls stating how common a certain belief is amongst the public but in most cases (that I consider) I have no polls to fall back on. I just have to use my judgment. In some cases, almost everyone I’ve spoken to about the subject is misinformed, bamboozled, or they misunderstand it. In other cases, I need to decide based on my impression. I have to guess.

A shocked woman in front of a screen | Choosing Super Facts
Super facts can be surprising, shocking, or something you refuse to believe, and yet they are true. Photo by Andrea Piacquadio on Pexels.com

Finding the Truth

As I mentioned, deciding on what is important or highly surprising is not an exact science. I think that is OK. There’s going to be super facts that are impressive and some that are less so. However, the third criteria is the one thing that I need to get right, and that is whether the fact is true or not.

We humans are not very rational, and we often believe with intense conviction things which are false. I think that is true for all of us. We don’t know what those false beliefs are, otherwise, we wouldn’t have them. However, this is where the super facts can come in handy, as tools for personal growth if we are willing to change our minds in the face of new evidence. This is easier said than done since we are emotional beings embedded in our culture, our tribal attachments and favorite myths. We have biases, we jump to conclusions, we overestimate our understanding of subjects we don’t know much about (see the Dunning Kruger effect), and we tend to believe what we want to believe. That goes for me too.

Adding to the difficulty on deciding what is true is the fact that the internet and especially social media is full of misinformation. There are an enormous amount of YouTube videos, podcasts, and websites touting false claims, conspiracy theories, and pseudo-science. There are political think tanks deceiving the public and industry funded organizations spending billions of dollars on misinformation, as well as people claiming to have special insights and superior knowledge.

I see the most ridiculous claims on Facebook and Instagram on a daily basis and the amazing thing is that people fall for it. If it supports their pre-existing beliefs or opinions, they see it as proof or conclusive evidence and they don’t take the time to question the source. When I see this, I often point out that the source is not reliable, or it may even be a satirical site, and I often add something from Snopes to my comment assuming they’ve investigated it.

Sure, when I do this, I am raining on someone’s parade, and it is quite often not welcome. No matter how politely I try to explain the situation I end up getting insulted or blocked. I should say, I’ve also fallen for fake information myself, but I try to accept it when someone points it out to me using reliable sources. The point is, we humans are really bad at deciding what is true, and we underestimate how bad at it we are, and deciding what is true is often a quite challenging task.

Before I publish a super fact, I need to be fairly certain that it is true. Outside of mathematics and logic you cannot be 100% sure about anything, but some facts we can say with very high certainty are true. For example, the earth is not flat like a pancake, the Sun is bigger than the earth, the capital of the United States is Washington DC, the heart pumps the blood, we breathe oxygen, carbon dioxide is a greenhouse gas, the light speed in vacuum is a universal constant, time dilation is real, Cesium-137 is radioactive, etc. Most likely you only know a very tiny fraction of a percentage of the facts that we know to be true with very high certainty. Some of those facts will surprise you, shock you, or are facts you would like to dispute, and I call them super facts.

Determining What Facts Are True

When I determine whether something is true with a high degree of certainty I start with my own expertise. For example, when someone claims that the second law of thermodynamics (entropy) contradict evolution I know that to be false because I have a degree in physics (master’s degree) and I’ve taken several classes in thermodynamics and statistical mechanics. In addition, I am very familiar with the faulty argumentation behind the claim because I’ve read dozens of creationist books. Yes, I was once bamboozled by creationism myself. Then I learned more about science, evolutionary biology, physics and thermodynamics.

Ludwig Boltzman’s formula from 1874
Second law of thermodynamics Shutter Stock Vector ID: 2342031619 by Sasha701

However, my personal expertise is not enough. I also find out about scientific consensus or expert consensus and evidence from reliable sources. I should say that using scientific consensus as a reliable indicator that something is true does not fall under the “appeal to authority fallacy”. The “appeal to authority fallacy” refers to appealing to influential people or organizations who may not necessarily be experts, and regardless of the evidence. In science you don’t really have authorities, you have experts who often disagree with each other. In the event almost all experts agree on a certain fact that has been thoroughly vetted you can trust that fact with nearly 100% certainty, and that is not appeal to authority but a probability argument.

I typically select several reliable sources such as research papers published in respectable journals, national academies, government websites such as NASA, NOAA, EPA, FBI, respected research organizations such Our World in Data, Pew Research Center, and academic publications and books. I make sure that they various sites I find don’t contradict each other regarding my prospective super fact. If they all seem to agree I accept the super fact and include a few of the links in my post.

If I don’t have much personal expertise on a subject I start out by asking Google AI. I don’t ask ChatGPT because I believe it is less reliable with respect to information. Then I check Wikipedia and or another online encyclopedia such as encyclopedia Britannica. This is not to establish the truth but to get an idea. Wikipedia is not an academically acceptable source, but it is rarely wrong and serves as a good first filter to save time. Then I start focusing on the reliable sources above and I will make sure I understand the evidence.

So, in summary I will use my expertise, scientific consensus, reliable sources and better, agreement between reliable sources, to determine if I can say with confidence that something is true. I will also frequently include links from Wikipedia in my posts because Wikipedia typically feature good summaries that are easy to understand. Naturally, anyone is free to dispute any of my super facts. Just make sure you provide good evidence from an arguably reliable source, or I cannot take it seriously.

Picture shows a scale held by a pointing finger. Fact is on the left shown as a bright light bulb. Myth is shown on the right as grey ball | Choosing Super Facts
Fact or myth. Shutterstock Asset id: 2327968607

Sources I will not consider are claims from unreliable sources, political think tanks, talk show hosts, politicians, articles written by contrarians heavily funded by industry or political organizations, and random Reels or YouTube videos, and I will not entertain conspiracy theories for my purposes. Also, I will ignore, articles with click bait titles, sources making claims about a great swindle by the scientific community, articles claiming everyone is lying to you, articles purporting to reveal the hidden truth, articles insisting on presenting the truth that “they”/the-others won’t tell you, etc. Cults will tell you that everyone else is lying to you. I’ve learned not to fall for it at this point.

My Super Fact List

Finally, here are a few examples of my super facts.

To see all the Super Facts click here

Time Dilation Goes Both Ways

Super fact 38 : If two observers are moving compared to each other both will observe the other’s time as being slower. In other words, both observers will observe the other’s clocks as ticking slower. Time slowing down is referred to as Time Dilation. And this post is about how time dilation goes both ways.

A lot of people know that if someone moves very fast his clocks will run slower. That’s relativity. If someone speeds through space in a rocket ship, close to the speed of light his time will slow down. When one hour passes on earth only half an hour may pass in the rocket. What comes as a shock to many people is when they find out that the converse is also true. When one hour passes in the rocket only half an hour will pass on earth.

Clearly that looks like a contradiction, but there is an explanation. I consider this a super fact because it is so strange and almost impossible for people to believe, and yet it is true.

The image shows two clocks side by side. On the left is a wall clock and on the right a wristwatch | Time Dilation Goes Both Ways
The guy on earth says my clock (left) is ticking double as fast as the rocket man’s clock (right). The rocket man say’s my clock (right) is ticking double as fast as the clock on earth (left). Who is right? Surprisingly both of them.

Postulates of Special Relativity

The two postulates of special relativity are:

  • The laws of physics are the same in all inertial frames of reference. An inertial frame is a system that moves at a constant velocity.
  • The speed of light in a vacuum is constant for all observers, regardless of the motion of the light source.

The first postulate is called the principle of relativity and goes all the way back to Galileo Galilei. It means that no experiment can determine whether you are at rest or moving at a constant velocity. The reciprocity of time dilation follows from this postulate. If the time for the rocket man in the example above was ticking at half the speed compared to the time for the guy on earth and they both agreed, then you could tell who was standing still and who was moving from that fact.

The first postulate demands that they disagree. The guy on earth thinks the rocket man’s clock is ticking at half the speed of his own clock, whilst the rocket man think it is earth man’s clock that is going slow. Therefore, you can’t tell who is standing still, which is what the first postulate requires.

The second postulate is the more shocking one and is special to relativity. It was discovered experimentally at the end of the 19th century but was too difficult for scientists to accept at first so various ad hoc explanations were put forth to explain it away, until the theories of relativity were created. I designated this postulate as my super fact #4 and you can read about it here.

The picture shows two people Alan and Amy. Alan is on the ground. Amy is flying by Alan in a rocket speeding left. Both Alan and Amy are pointing lasers to the left | Time Dilation Goes Both Ways
In this picture Amy is traveling past Alan in a rocket. Both have a laser. Both measure the speed of both laser beams to be c = 299,792,458 meters per second. The speed of light is a universal constant.

Time Dilation

In the pictures below I am showing two rocket systems in space, Amy’s rocket and Alan’s rocket. They are travelling at a high speed compared to each other. Each rocket has a light clock that consists of a light beam bouncing up and down between a mirror in the ceiling and a mirror on the floor. The two light clocks are identical, and each bounce corresponds to a microsecond.

Amy is passing Alan at a high speed, and therefore Alan will see Amy’s light clock running slower than his because Amy’s light beam must travel further. Remember, the speed of light is identical for both light clocks (light speed is a universal constant). For those interested I am also deriving the formula for time dilation.

The picture shows two systems, each with a clock consisting of light beams bouncing between mirrors. In this set up Alan is stationary compared to us and therefore his light beam only moves vertically.
Alan and Amy have identical light clocks. We call the time it takes for the light beam to go from the floor to the ceiling (one clock tick) Dt in Amy’s case and Dt’ (reference frame) for Alan. Amy is speeding past Alan towards the left. From Alan’s perspective Amy’s clock is running slower. Using Pythagoras theorem, it is possible to derive the formula for time dilation shown in the lower left corner.

Since Amy moving left is the same as Amy standing still and Alan moving right you can say that Alan is the one moving fast. In this case it is Alan’s light clock that is ticking slower because from this viewpoint it is his light beam that has to travel further. From Amy’s perspective it is Alan’s clock that is going slower.

The picture shows two systems, each with a clock consisting of light beams bouncing between mirrors. In this set up Amy is stationary compared to us and therefore her light beam only moves vertically | Time Dilation Goes Both Ways
It is equally correct to say that Amy is standing still and that it is Alan that is moving fast to the right. This time (pun not intended) it is Alan’s clock that is ticking slower. Dt corresponds to Alan’s clock ticks and Amy’s clock ticks are Dt’.

This seemingly contradictory situation is resolved by the fact that Amy’s and Alan’s perspectives will drift apart as they continue their journey. They will increasingly disagree on whether events are simultaneous or not, and they will disagree in which order events occur. This is another shocking fact, or as I refer to it, super fact. It is strange but it resolves the apparent contradiction of reciprocal time dilation. I am explaining this in greater detail in this post.

The Twin Paradox

But what happens if one of Amy or Alan decides to turn around so that they meet up again. If Amy’s clock runs slower from Alan’s perspective and Alan’s clock runs slower from Amy’s perspective, how can you reconcile that when they meet up again? It turns out that whoever is turning around or accelerating or decelerating to turn back is the one who will have the least time pass. If Amy is the one turning back, then she will age less than Alan. During her acceleration she will see Alan’s clock starting to run faster and faster until he is older her.

Let say Alan’s clock is running half the speed of Amy’s clock from Amy’s perspective and Amy’s clock is running half the speed of Alan’s clock from Alan’s perspective. Let’s also say that Amy traveled to the left for 10 years before turning around.

From Alan’s perspective she would have traveled 20 years before turning around. However, from Amy’s perspective 5 years would have passed on Alan’s clock. As she turns around Alan’s clock will run faster and catch up so that when they meet up again Amy will be aged 20 years, while Alan will be aged 40 years. That is 35 years of catching up for Alan’s clock from Amy’s perspective. Alan’s clock advanced 35 years from Amy’s perspective after Amy turned around. In the end Amy will be the younger one.

The picture shows Amy on the left turning around and Alan on the right. Text explains what happens | Time Dilation Goes Both Ways
Observe that the fast-forward advancement of Alan’s clock from Amy’s perspective happens only while Amy is in the process of turning around (accelerating / decelerating). Further, how fast the fast forward happens depends on the distance as well. Once Amy is traveling at a constant speed again (inertial frame) Alan’s clock will run slower again from Amy’s perspective.

A somewhat halting but OK analogy for the 35 years of catching up that happens on Alan’s clock from Amy’s perspective is when you turn a boat around on a wavy sea. As you are moving in the direction of the waves the waves will hit you much less often (if at all) but after you turn around and move against them the waves will hit your boat very frequently. Alan’s clock will run faster for Amy whilst she is turning around.

Book Recommendations on Relativity

To see the other Super Facts click here