Sound waves can only move through solids, gases, and liquids; they cannot travel through vacuum. Space has no medium for sound waves to travel through, and it is completely vacuumed. As a result, astronauts in space cannot hear or communicate with one another. To listen and communicate, they need a radio.

No, this alleged torture gadget did not exist. The widespread usage of the term "mediaeval" is a typical 18th-century fiction, fueled by conceptions of the Middle Ages as a generally uncivilised era of murder and mayhem. (They weren't awful, but they weren't great.)

The official language of Vatican City is Italian, which is used for all official issues. Although Italian is the lingua franca, the Holy See utilises Latin as its official language. The Vatican is also regarded as the de facto keeper of the Latin language. So it may not come as a surprise that the Vatican Bank's ATM provides instructions in Latin.

Although stingrays don't have teeth, they still resemble sharks in a number of ways. They share similar skin and belong to the same family of cartilaginous fish, which are supported by cartilage rather than bones in their skeletons. Additionally, they employ the same ampullae of Lorenzini sensors, unique sense organs that detect electrical signals released by prey.

Limes float, but lemons sink. Because limes are denser than lemons, they sink to the bottom of a glass, whereas lemons float on top. This is the one that has been in front of our faces (or rather, in our glasses) the entire time! Check out these other things to ponder that you probably never considered before.

Area 51 is a government-owned piece of property in the United States that is considered to be the site of intense extraterrestrial activity. But did you know that in the Marvel reality, Iron Man really owns Area 51? Iron Man bought Area 51 from the government and used it as a safe haven for the reality jewel.

It is home to the country's only legal two-wheeler taxis. This is the only place in India where you can pay a motorcyclist for a lift without fear of riding off with a stranger! Goa is teeming with motorcycle taxis and pilots, who are known as the state's most cost-effective mode of transportation.

Almonds are members of the prunus family, which includes peaches, cherries, and apricots. The nuts that we are so acquainted with are actually the fruit's seed. The fleshy section of the almond fruit, unlike its fruity sisters, cannot be eaten.

According to an Air Accident Investigation & Aviation Safety Board report, those masks only provide 12 minutes of continuous airflow on a 737. Fortunately, that is usually just enough time for your plane to find a safe landing spot.

Scratching can temporarily relieve the itching associated with eczema, but it never provides long-term relief. Scratching the affected area of the skin can aggravate the irritation and inflammation and expose your skin to infection.

Water is vital for mosquitoes because they lay their eggs, which hatch into larvae known as wigglers. These wigglers feed on organic materials in stagnant water and breathe oxygen from the surface. These wigglers eventually mature into pupae that do not feed and are partially enveloped in cocoons. These pupae mature into adult mosquitos after a few days. Before a mosquito can fly, it must go through this process for ten days. Use a mosquito repellent spray or a roll-on insect repellent.

The Indonesian flag, with a red stripe at the top and a white stripe at the bottom, does not appear to be the most inventive or thoroughly thought-out in the globe. While Poland's flag is reversed (white on top and red on the bottom), Indonesia and Monaco have flags that are nearly identical, with the exception of Indonesia's flag being somewhat broader.

Because red hair keeps its pigment more tightly than any other hair color, it must have its pigment taken before being colored by bleaching, which, of course, destroys the hair. Continue to wear red!

which is why braille books are much larger than their counterparts. For example, “Harry Potter and the Goblet of Fire” is 10 volumes in braille, the “New American Bible’’ is 45 volumes, and “Webster’s Unabridged Dictionary” is a shelf-hogging 72 volumes.

That's because each meal contains large amounts of vitamins A and C, which support healthy immune function. Additionally, vitamin C is a crucial antioxidant that helps shield cells from harm.

A genome-wide examination of insomnia condition discovered that insomnia was linked to specific genetic variants on chromosomes 7 and 9. Chromosome 7 is discovered near a gene involved in brain development and electrical sleep signaling. Similarly, according to a Sleep Journal study, approximately 35% of patients with insomnia had a familial history of insomnia.

One of the most well-known facts about Jaigarh Fort is that it is home to the World's Largest Cannon on Wheels. This, known as Jaivana, was made in the Fort's cannon foundry. I don't think my photographs do this cannon's massive size justice. The amusing aspect is that, despite its size, it was never utilized in a conflict! It was only fired once for a test, and the cannon projectile went 35 kilometres.

Even more "folded" than the human brain, the dolphin brain existed millions of years before the emergence of humans. Scientists frequently gauge IQ by counting the "folds" in the brain.

The Spaniards celebrate Christmas, the New Year, and the Three Wise Men feast during the winter holidays. This time of the year is very special and they live it intensely. A fun fact about Spain is that it is traditional to eat twelve grapes at a time to receive the new year. It is more difficult than it seems, but the Spaniards swear that achieving that gives good luck for the rest of the year.

William-Adolphe Bourguereau, a young crocheter (1825–1905) Despite a few extremely ancient crocheted artefacts, the practise was uncommon in Europe until the 1800s. According to an intriguing theory I've come across, knitting and crocheting both require more fibre than the other, and fibre production was challenging prior to the 1764 invention of the spinning Jenny.

Fish would never have developed into land animals, including us, without plants to eat.

The Taj Mahal is almost perfectly symmetrical, in keeping with Persian and Islamic architectural principles. The minarets (towers), walls, rooms, and even gardens are all symmetrical. The Taj Mahal, one of the world's most perfectly symmetrical structures, is known for its white beauty and sheen. The placement of Shah Jahan's cenotaph — and his grave — are possibly the only elements of the Taj that do not adhere to perfect geometric proportions and symmetrical precision.