Reddit users decided to share the darkest facts from science and medicine that scare the hell out of them. From sudden, deadly blood clots to mysterious black holes, there's something to scare everyone in this collection. 
1. “In the 1800s, there was an event [geomagnetic storm] caused by solar activity where telegraphs ran on their own without electricity and seemed to cause little damage. If this happens again, it will destroy all of our Internet network capabilities and other electrical equipment. It was called the Carrington Event." 
2. “If you were diagnosed with Alzheimer's disease at age 65, you have had it since you were at least 40 years old. And you were experiencing very mild symptoms, but you just didn't notice them. Plus, your brain was fighting hard to compensate for the deficit. When you are diagnosed, your brain is already very damaged and will never recover from the deficit.” 
3. “Our white blood cells fight cancer cells every day.” 
4. “The fact that at any moment we can simply develop a blood clot and die before we even realize that something has happened. The human body has a lot of ways to just suddenly die, and it's terrible." 
5. “Metaphysical aspect of consciousness. Where is consciousness? What it is? When does it really end? Where does it go when we die? When do we sleep? How does it occupy our entire being without being physically present? We are literally the universe experiencing itself in a fragile little bubble on a speck of dust in a sunbeam. And yet, what exactly are we? This is the question that keeps me up at night. I’m not afraid of death, I’m not afraid of the destruction of the world, but the very fact of self-awareness worries me deeply.” 
6. “When the atomic bomb was created, the leading scientists of the time associated with the project had to calculate the flammability of the Earth's atmosphere to ensure that the explosion of the bomb would not cause the atmosphere to ignite.
When the first atomic bomb was detonated, scientists still didn't answer this question, which means we literally crossed our fingers and hoped we didn't set the damn planet on fire. People are stupid creatures." 
7. “There is a form of insomnia that causes the body to be always awake; It has a 100 percent mortality rate.” 
8. “Dark Age of the Universe. When all the stellar fuel disappears (and it will), and all the white dwarfs become cold and dark (and they will), and all the black holes evaporate into elementary particles (and they will), the Universe will become a cold, dark place... Forever " 
9. “Rabies.” You can become infected with it and not know it until it decides your time has come. And then you will die a terrible death.” 
10. “Space in general. Or the fact that the Higgs field is not in true equilibrium and that going back to it would destroy everything we know." 
11. “During wastewater treatment, the water is aerated so that the bacteria that break down feces have enough oxygen. Because of the introduced air, the density of the water is so low that a human body (or almost any object that would normally float) will go straight to the bottom.” 
12. “The Mariana Trench is so deep that Everest could fit in it. Even if you stand at the top, there is still a lot of space above your head to the surface of the ocean.” 
13. “That one day I will die. I don’t know why, but sometimes at night when I’m trying to sleep, I suddenly think about it and panic hits me.” 
14. “The subduction zone of the Pacific Northwest coast is 965 kilometers long, and it is already about 70 years behind a magnitude 8.8-9.2 earthquake, and nothing built on this coast will be able to withstand it.” . There have never been major earthquakes on this coast since European contact, with the last major earthquake occurring in 1700.
Unlike Japan, which suffered a similar earthquake in 2011, the American Northwest is not prepared for it and the buildings here are not prepared for what is to come. Seattle, Vancouver, Portland and Victoria will soon tilt 2 meters inland, shake violently for 5-7 minutes, and then be hit by a 30 meter high tsunami.
The earthquake is predicted to kill tens of thousands of people, displace millions and destroy trillions of dollars; the second worst humanitarian disaster in North American history, second only to Haiti. And it seems that everyone around is stupidly pretending that this will not happen.” 
15. “Viruses cannot be classified as living organisms, but they behave as if they are fully aware of their environment and evolve to adapt to it. They act like they have a brain, but they're just nucleic acids." 
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