Robin Dunbar, a British anthropologist, developed Dunbar's number in the 1990s after discovering a relationship between the average size of a social group and the brain size of primates. The suggested cognitive limit for the number of people with whom someone can maintain a stable social relationship is 150. Exceeding this number is extremely rare, because becoming close to new people causes the quality of some older relationships to deteriorate over time

Mirrors and light are the primary components used in kaleidoscope construction. Kaleidoscopes are a fantastic way to reflect things when combined with a few more materials.

The business created special socks that could detect when a user fell asleep and stop the show/movie so they didn't miss anything when they awoke. This pair of socks, dubbed 'Netflix Socks,' includes a sewn-in electrical gadget that monitors your pulse.

Vitamin K, which is present in kiwi fruit, improves bone mineral density and prevents osteoporosis (weak bones). Additionally, vitamin K deficiency is linked to an increased risk of hip fractures2, so eating foods like kiwis to maintain adequate vitamin K levels is a great way to prevent bone deterioration, especially as you age.

As they develop, centipedes moult. Every time they moult, they grow another set of legs naturally, so the older they get, the more legs they have. The fact that they can actually grow new legs after being amputated by predators is truly bizarre. Centipedes have the ability to detach some of their legs in order to escape from a predator's grasp. Then, when they moult, they simply regenerate their lost legs!

The finding of a submerged continent in the Indian Ocean known as the Kerguelen Plateau, which is thought to be of volcanic origins, is an intriguing fact from Indian Ocean facts.

The first emperor of China, Qin Shi Huang, started building the Terracotta Army in 246 BC, shortly after assuming the throne at the age of 13. 
 

The Vatican is the only nation that has been listed as a World Heritage site on its whole. It was added to the list in 1984. The list contains both the city of the Vatican and extraterritorial sites in Rome, such as St. Peter's Basilica and Saint Mary Major.

In Switzerland, 530,000 individuals are classified as poor, with a monthly income of CHF2,219 ($2,275.40) for singles and CHF4,031 for families of two adults and two children. That equates to 6.6% of the population, down from 9.3% in 2007. The proportion of Swiss people living in extreme poverty (4.6%) is among the lowest in Europe (18.6% on average). In Switzerland, 9.7% of the population cannot afford a week's vacation abroad; the European average is 36.9%.

Most likely, when you hear the word armour, you picture steel-protected knights. Although the ancient Inuit had no access to steel, they nevertheless needed defence against the elements and dangerous creatures. Because of this, they created their own type of armour using bone plates, mainly carved from walrus teeth, and raw leather straps. The first Inuit people were able to escape several confrontations that would have almost surely been fatal without this innovative construction.

We bet your average Hyrax doesn’t know its hardened poop is so special that people want to spray it on their bodies. A lot of niche perfume houses use this animalic, fecal note in their perfumes even now.

When perfumers try to derive the scent of a flower, many of its aspects are lost once it’s dried and pressed into oils. So perfumers try to add those characteristics back by adding notes which make it smell more realistic. One weird way that’s done in the case of white florals, is by using Indole. Derived from coal tar, this smells like camphor and mothballs when pure, and gives a fecal scent to enhance the intensity and depth of jasmine perfumes to make these fragrances smell more like the real flower.

The following are the criteria for the diagnosis of PCOS: Anovulatory infertility decreased flow during menses; excess facial hair; Polycystic ovaries on ultrasound. The presence of any two of the above three criteria is necessary for the diagnosis of PCOS. Even if polycystic ovaries are not there, with the presence of the other two criteria, it is still diagnosed as PCOS.

Consistently on the late spring solstice, a special ball game is played at the Growden Remembrance Park known as the 12 PM Sun Game. The game took place in Fairbanks, Alaska, and because the Sun was out for almost 24 hours on the solstice, there was no artificial lighting from 10:30 p.m. to 1:30 a.m. The custom started in 1906 and has been played consistently beginning around 1960 by The Frozen North Goldpanners.

Chia seeds make a gelatinous mixture when soaked in water, plant milk, or any other liquid, which is ideal for making a creamy pudding or thick sauce. The soluble fiber in chia also has the added benefit of stabilising blood sugar levels and lowering cholesterol. With this pantry essential, everyone wins.

Walt moved to Los Angeles with his older brother Roy in 1923 to pursue an animation career. Walt was encouraged to do the same by Roy, who had been selling vacuum cleaners door to door to make ends meet. Before Walt could fall for a Kirby-esque scheme, he received a call from a company in New York asking him to create shorts for them.

Back in the 10th century, carrots were originally white, purple, or pale yellow. So how did they get their distinct orange colour? The story goes that when William of Orange (King William III) helped the Dutch win independence from Spain in the 17th century, Dutch farmers honoured the King by turning their carrots orange through clever breeding. The new colour became hugely popular and is still the Netherlands official colour and the colour of the Dutch Royal family. The Dutch celebrate King’s Day by wearing orange and even the national sports teams wear orange.

One of our favourite amusing facts about Poland is that it is home to the world's first upside down house. The topsy-turvy wooden home was erected upside down in a forest and appears to be something out of a storybook. Visitors must enter the home through the attic windows and may walk around the furnished interior, which is evocative of Communist Poland in the 1970s, to symbolise how Communist control turned life in Poland upside down. Hundreds of interested visitors have visited the home since its unveiling in 2007, and it is located in the little Polish town of Szymbark, which has a population of roughly 500 people.

Few people realise it, but the city's environment and surrounding countryside served as inspiration for J. R. R. Tolkien's classic sagas The Lord of the Rings and The Hobbit. The author grew raised in Moseley from the age of four, and the stories are based on local sites and people.  The Hobbits' home, the 'Shire,' was inspired by the fields and mill at Sarehole, a village that has since been absorbed into the city's suburbs, while Perrott's Folly and the Waterworks Tower in Edgbaston, as well as the University of Birmingham's illuminated clock tower, can be seen in The Lord of the Rings.

"Smells Like Teen Spirit" was a furious rock anthem that exploded out of the speakers, making everything else on MTV seem puny and insignificant in comparison. The author of the song heard it differently. "It's such a perfect combination of cleanliness and nice, candy-ass production," Cobain said in an interview with biographer Michael Azerrad. "It may seem extreme to those who aren't used to it, but I think it's kind of lame."

Can crickets ever be made from the same substance as crickets? You should never make a cricket ball out of old planks of wood. Almost all bats seen in England are made from willows, which are known for their brightness. They are manufactured specifically of white willow, often known as cricket bat willow. The trees are endemic to West and Central Asia, and they have historically been used as a weapon. Because the wood is lighter, hitters can strike the ball more accurately.

Eggnog is a trademark beverage of the holiday season, with a history reaching back to mediaeval times and a drink known as "posset." According to Healthline, monks in the 13th century "enjoyed this concoction with the addition of eggs and figs," which was made with sweetened and spiced milk curdled with ale or wine and served hot.