The number 1 is frequently misidentified as a prime number. However, this is not the case—one does not meet the qualifications to be prime (being divisible by both 1 and itself). 1 divided by 1 equals...1. Nothing has been split.

Have you ever heard that the number 9 is said to be "magical"? No? It is, and here's why: if you multiply a number by 9 and put all of the digits of the new number together, the total will always equal 9.

A perfect number is a positive integer that is equal to the sum of its positive divisors in number theory. Six is the lowest perfect number, according to this criterion. If you scratched your brow and said, "Huh? The next perfect number is not until 28. It turns out that perfection is really rare...

Pi, often known as the circumference to diameter ratio of a circle, is an irrational number. This is due to the fact that Pi cannot be expressed as a fraction. Also, whether represented as a decimal, Pi never repeats or stops. Oh, and March 14th, or 3/14, is a declared Pi Day.

Leonardo Fibonacci was a native of Pisa. He lived in the 13th century in Italy and is credited with developing the Fibonacci Sequence, which is currently named after him. Beginning at 0 and 1, this series is formed by adding the total of the two preceding integers in the sequence. The Fibonacci Sequence appears frequently in nature, most notably in rabbit litters. In addition, the American prog metal band Tool's song "Lateralus" is written in time with the Fibonacci Sequence.

You've probably never considered it, but there is only one number that is spelt with the same amount of letters as itself. Can you figure out which one it is? No? It's 4 o'clock now. Oh, and a calculator's number 4 is made up of four light bars. Tell your friends about this at your next get-together! (However, you might not make many friends.)

Any number may be multiplied by three. Then put all of the digits of that new number together. Whatever number that equals will always be divisible by three, regardless of the starting number.

The concept of zero as a number was developed at various points throughout history. Despite this patchy acceptance, it is widely recognised that the notion of zero was introduced for the first time about 600 A.D. by the Indian astronomer and mathematician Brahmagupta. Aside from that, Brahmagupta made significant contributions to mathematics and astronomy, and is best known for describing how to compute the cube and cube-root of an integer, as well as for providing methods for calculating squares and square roots.

An even number is one that can be divided by two and still produce a whole number. Zero fits the requirements since halving zero results in zero. But you're not alone if you're perplexed: According to Cambridge University research from the 1990s, people are 10% slower when choosing whether zero is even or not than they are when deciding if two is even.

The method of record-keeping was widely employed across the Roman Empire for everyday tasks, allowing Romans to quickly price different commodities and services. Roman numerals were continuously employed throughout Europe after the collapse of the Roman Empire. This, however, came to an end around the 1600s. The letters I, V, X, L, C, D, and M are used to represent Roman numerals.

The term "hundred" is derived from the Old Norse word "hundrath," which implies 120 rather than 100. In Old Norse, "hundrath" means "long hundred," which equals 120 owing to the duodecimal system. But good luck arguing that your $100 note is worth 20% more than it is.

You've probably heard of the Pythagorean Theorem from 10th grade geometry class, but have you heard of Pythagoras' Constant? So, here's the skinny: Pythagoras' Constant is the square root of 2 (1.41). It's also the first irrational number ever discovered.

In Roman numerals, there are a total of zero zeros. While the ancient Greeks were aware of the idea of zero, they did not believe zero to be a number. For example, Aristotle determined that zero was not a number since it could not be divided by zero. To indicate the notion of zero, the Latin term "nulla" would have been used instead of a Roman numeral. There was no need for a numeral to symbolise zero, thus there was no need for one.

Sechs Kies is South Korea's most established idol group. The band was founded in 1997 with six members and currently has five active members. Some may not consider them the longest because they were on hiatus for more than ten years; however, the longest-lasting idol group could also be considered Shinhwa, who debuted in 1998 and has been promoting consistently for the past 20 years.

In the 1990s, Korean pop musicians incorporated American popular music styles. Seo Taiji and Boys were the forerunners of this style, releasing the infamous single "I know" in 1992. It was so controversial that most critics despised their music and predicted that they would never make it. Nonetheless, the group quickly became enormously popular. Yang Hyun Suk of YG Entertainment was a member of the group, which is regarded as part of K-revolutionary Pop's period.

In Korea, age is given precedence over all other considerations. When conversing with someone of a higher rank or age, formal language must be used. Similarly, when conversing with a junior/someone younger, you can use informal language (banmal, ). Unless two people agree to use banmal at the same time, this usually remains the case. Even in a k-pop group with members who are mostly around the same age, a few months difference in birthdate can make a big difference.

Korean popular music can be traced back to 1885, when an American missionary named Henry Appenzeller started teaching American and British folk songs at a school. These songs were usually based on a popular Western melody and were sung in Korean.

Most YouTube videos of adorable pairs of animals from different species fail to meet scientists' definitions of "friendship" (a long-lasting bond of sacrifice, shared moments and hurt after loss). Several studies, however, have shown that animals, at least chimps, baboons, horses, hyenas, elephants, bats, and dolphins, can form lifelong friendships with individuals who are not of their species. In Kenya, there is even documented evidence of a friendship between a centenarian turtle and a young hippopotamus.

During the Victorian era, there was a significant change in the way people dressed. The Victorian dress reform, also known as the rational dress movement, occurred between the 1860s and 1890s, during the middle and late Victorian eras. Reformers proposed, wore, and even designed clothing that was more practical and comfortable than what was available at the time.

Dresses had a "day" bodice with a high neckline and long sleeves and a "evening" bodice with a low neckline and short sleeves. There was little variation in dress length during this time period, and hemlines were either ankle-length or floor-sweeping.

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.

Taz became a popular cartoon character thanks to Looney Tunes. In reality, though, the devil is anything but. According to one research, it possesses the most powerful bite in the planet. Despite weighing just 20 pounds on average, these creatures can apply up to 94 pounds of pressure, giving them a "Bite Force Quotient" of 181. That's about twice as powerful as a hyena and 60 points stronger than a lion.

In 1996, a team of anatomists at the University of Adelaide in Australia revealed that koala and human fingerprints are readily confused, most likely due to the fact that koalas are primates' progenitors.

Throughout their lives, clownfish experience what it's like to be each gender. They are all born male, but some of them mature into girls (a process known as sequential hermaphroditism). Both are born with both male and female parts, and some males become alpha females if alpha females die.

Beavers chew to keep their teeth at an acceptable length because their teeth never stop growing. However, their teeth are also designed to withstand chewing. They feature an enamel composed of iron, which gives them an orange colour but also keeps them sturdy and acid resistant.