Speaking of astronauts, their experience has shown that transitioning from weightlessness to gravity can be taxing on the body. Muscles atrophy and bones lose bone mass in the absence of gravity. According to NASA, astronauts in space can lose 1% of their bone mass per month.

Start counting those sheep, since sleep is crucial. Many of history's worst tragedies, such as Chernobyl, Three Mile Island, the Challenger explosion, and the Exxon Valdez oil leak, were caused by a lack of sleep.

Psychologists have examined a phenomena known as reactance, which states that when individuals think that particular liberties are being taken away, they not only break the law, but break it significantly more than they would normally in order to reclaim their freedom. This might be one of the finest psychological facts to explain why a youngster who isn't allowed to use his phone in class will chew gum while texting.

There is a lot of evidence that following a pattern for 66 days will make it habitual. If you want to be better at cleaning your house or going to the gym, make a concerted effort to do so for 66 days, after which it will become a habit and be easier to maintain (this also works for breaking habits).

You may hear people claim to be natural multitaskers, and you've probably even seen it in job descriptions, but humans simply cannot multitask. You can listen to music while working, but your brain can only handle one higher-functioning task at a time. That means you'll either be working and ignoring the music, or you'll be working and ignoring the music. People are incapable of thinking about two things at the same time.

The Egyptians placed a high value on the afterlife. They thought that by mummifying a deceased person's corpse, their spirit would continue on in the afterlife for all eternity.

It's extremely unusual, yet it has happened. The event known as "coffin birth" happens when a pregnant woman dies and her kid is born spontaneously owing to gases that build up in the abdominal area, placing pressure on the mother's uterus and driving the baby through the birth pathway. According to Smithsonian, one example of this was discovered in the grave of a mediaeval woman who was buried in Italy in 2010.

It doesn't seem to matter what others say about a new lover—in our eyes, he or she is always ideal. This blindness is essential for us to progress in our relationship. It is frequently required to progress to the "attachment stage," as scientists refer to it so that they can stay in love long enough to produce and raise children; in other words, to populate the globe.

A translator rewrote the story in the 1600s. When the prince attempted to follow Cinderella, Aschenputtel (Cinderella) lost her left shoe at the stairwell.

Ancient Egyptians regarded cats to be sacred creatures. Most households are said to have kept a cat as a pet because they felt it would bring them good luck!

Your brain is working on problem solving and learning skills while you sleep. If you're learning a new skill or studying new information, getting enough sleep and having dreams can help you learn faster.

Robin Dunbar, a psychologist and the director of Oxford University's Social and Evolutionary Neuroscience research department, believes that every guy should spend at least two hours a week with 4-5 buddies. They can use this time any way they choose, from sports to going to bars. According to Dunbar, guys with faithful friends are less likely to be sad and have a better immune system.

Dresses were worn by men from many cultures around the world. The Scottish kilt, for example, and the toga worn by the ancient Greeks were all examples of menswear. Dresses were only later appropriated by women, and men stopped wearing them.

Why doesn't your stomach digest itself if it has so many enzymes and acids that it can digest a piece of meat? It turns out that it sort of does. The cells that line your stomach proliferate fast in order to replace the cells that are killed in the course of their everyday tasks. Every three days, we develop a new gut lining.

Tooth decay occurs when bacteria in your mouth convert sugar into acids, further eroding the tooth's surface and causing cavities. Cocoa beans contain antibacterial agents that inhibit the growth of these bacteria and help to prevent tooth decay. Dark chocolate contains more cocoa than milk chocolate. However, this does not imply that you consume chocolate on a daily basis.

It may be difficult to believe, but we have roughly the same number of hairs on our bodies as chimps; the difference is that our hairs are useless, being so fine that they are almost invisible. We're not sure why we lost our furry protection. It has been proposed that this was done to help early humans sweat more easily, to make life more difficult for parasites like lice and ticks, or even because our ancestors were partially aquatic.

Men have selective hearing, it's a fact! They can only listen to their female partners for 6 minutes, but this time is more than doubled to 15 minutes when they talk to their male friends. Before you start blaming men for their lack of attention, keep in mind that women pay more attention to conversations with their friends than to conversations with their romantic partners.

In the 13th century, Pope Gregory IV waged war against cats. He said that black cats were Satan's tools. He commanded the annihilation of these felines throughout Europe as a result of this notion. This strategy, however, backfired, resulting in a rise in the number of plague-carrying rats.

Martin Lotze, a German researcher, studied the brains of both professional athletes and professional writers and discovered that their brain activity during athletic competition and the writing process was very similar. Lotze discovered an interesting difference between professional and amateur writers: professional writers used their speech-processing centres of the brain to develop their stories, whereas amateur writers relied on their vision centres to imagine the story first.

In the winter, street sellers offer ice cream from paper boxes on the street. At -30 degrees Celsius, there's no need for a freezer (-22 degrees Fahrenheit).

Those enormous Stetsons you associate with cowboys like John Wayne, Billy the Kid, and Wyatt Earp? Yeah. Those were not worn by cowboys. In reality, the headgear of choice for nineteenth-century cowboys was a bowler hat.

Guns and tiny toddlers are the ideal mix for having fun. A terrific location to take your kids, ages 12 to 18, that is completely safe. Simply purchase a ticket for them and they are set to enjoy their time at the military "Disney" camp. Despite the fact that this location is officially affiliated with Disney, the character of this "amusement park" is everything from childlike. Professionals teach children how to handle assault and sniper rifles and even introduce them to bare-handed fighting. Every day that they stay there, they practise their survival abilities, as the campers typically take on an obstacle course and form teams for sporting contests after breakfast.

Austrians celebrated their victory over Hungary during the 1848 revolution by clinking their drinks during a toast. Since then, Hungarians have avoided clinking their glasses while toasting since it reminds them of their loss. Instead, if you're drinking a beer in Hungary, say "Egészségedre" while looking your drinking companions in the eyes.

You may have noticed that women take more risks than men, and there is a scientific reason for this. Women have a larger anterior cingulate cortex than men, which is the part of the brain that weighs options when making a decision. Some argue that this was evolution's way of making women better caregivers and saving the "tribe" when it came to gathering food and establishing social structures.

Archaeologists uncovered a tablet in Iraq in 1976, which has since been lost. Researchers, on the other hand, were able to interpret and decipher the writing from an image of the tablet. What were the outcomes? We know the tablet contains jokes, but the complete context has been lost in translation. The world's oldest your mother joke is "...of your mother is by the one who has relations with her." "What or who is it?" Do we comprehend it? No way, but we know a "your mom" joke when we see one!