The theories of Einstein describe how massive objects distort space-time. According to Einstein, the movement of these objects should cause ripples in the fabric of space itself. In fact, three Nobel Laureates were able to observe a collision between two black holes 1.8 billion light-years apart. One of these black holes is 31 times the mass of our sun, while the other is 25 times. In a fraction of a second, the collision converted the mass of approximately three suns into gravitational wave energy!

Even on Earth, gravity isn't perfectly balanced. The globe's mass is distributed unevenly because it is not a perfect sphere. In addition, uneven mass results in slightly uneven gravity. One mysterious gravitational anomaly can be found in Canada's Hudson Bay (shown above). This region has lower gravity than other regions, according to a 2007 study, and now-melted glaciers are to blame.

Black holes are some of the most destructive objects in the universe, so-called because nothing, not even light, can escape their gravitational clutches. A massive black hole with the mass of 3 million suns sits at the centre of our galaxy. What could be scarier? According to Tatsuya Inui of Kyoto University, it could be "just resting."

On Earth, gravity is fairly consistent, but our perception of it is not. People are better at judging how objects fall when they are sitting upright rather than lying on their sides, according to research published in the journal PLoS ONE in April 2011. The discovery implies that our perception of gravity may be based less on visual cues of gravity's true direction and more on body orientation. The findings could pave the way for new strategies to assist astronauts in dealing with microgravity in space.

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.

Pluto is no longer a planet, but it is still a good bet for lightening up. On the dwarf planet, a person weighing 150 pounds (68 kilogrammes) would weigh no more than 10 pounds (4.5 kg). Jupiter, on the other hand, has the most crushing gravity, weighing more than 354 pounds (160.5 kg). Mars, the planet most likely to be visited by humans, would also leave explorers dazed. Mars' gravitational pull is only 38% that of Earth's, implying that a 150-pound person would feel as if they weighed 57 pounds (26 kg). You are not fat, you are just on the wrong planet. 

Queen Elizabeth I used to use ceruse, a combination of white lead and vinegar, to paint her face. Despite how appealing these two components appear, you'll be surprised to learn that they are incredibly corrosive and ageing. "Those ladies that use it on their faces, do rapidly become withered and grey haired, for this doth so terribly dry up the naturall moisture of their flesh," one of her contemporaries observed of women who used ceruse. That sounds like a fantastic concept!

Ventriloquist dummies, like dolls, have become a staple of horror films. A ventriloquist's dummy named Slappy is one of R.L. Stine's most iconic antagonists. If they terrify you, avoid visiting the Ven Haven Museum near Fort Mitchell, Kentucky. Vintage ventriloquist dummies line the walls. This is undoubtedly your worst nightmare if you're afraid of dolls. How funny, these people should have destroyed them, but no, they thought why not show it to the world...

Some individuals in Ancient Rome thought that if they drank the fresh, warm blood of a fallen Gladiator, they would gain power. They also thought that consuming blood may help them recover from epilepsy.

The renowned brunch cocktail and hangover remedy was not always known as a Bloody Mary. Nope. It was originally titled A Bucket Of Blood. Appetizing… Following Bucket of Blood, it moved on to Red Snapper and, eventually, Bloody Mary.

The mythical hero existed in real life. His given name was John Chapman, and he was from Leominster, Massachusetts. He also has a street named after him, however city planners believed that using his fabled name would be more poetic: Johnny Appleseed Lane.

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.

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.

There are many misconceptions surrounding Washington, but one of the most common has to do with his teeth. Washington is commonly assumed to have had wooden dentures. This is not at all the case. While Washington had severe oral issues and wore dentures, wood was never employed as a material.

Seattle residents Peter Cicero and Richard Sclafani are credited with inventing the number-themed eyeglasses that are now seen at New Year's Eve parties around the world. According to the Wall Street Journal, their first set, which read "1991," sold 500 pairs. The following year, approximately 3000 sets were purchased.

According to ABC News, most experts believe Robert Burns wrote the song "Auld Lang Syne" in the 1700s. Guy Lombardo popularised the song by using it as a segue between radio shows at midnight in 1929, though the midnight timing was not on purpose.

If you don't like grapes, wearing crimson underwear on New Year's Eve is also said to bring good luck. The custom of wearing red underwear on December 31 is widespread, spanning Italy, Spain, Bolivia, and beyond. Everyone is welcome to take part; men and women alike follow the tradition. Participants also have a variety of clothing options as an added bonus. Others wear socks, bras, and garters, while some wear red boxers, briefs, or panties.

The Salem witch trials took place between February 1692 and May 1693 in Salem, Massachusetts. Nearly 200 individuals, including the destitute, the elderly, and a four-year-old kid, were accused of witchcraft. The vast majority were imprisoned, and some were executed by hanging. However, none of these people were ever burned alive.

While Walt Disney invented Mickey Mouse and gave the voice, the visual was developed by animator Ub Iwerks, who designed all of the famous characteristics. You'll never look at the adorable mouse the same way again.

It wasn't Henry Ford's Model T back in 1908. The first vehicle was built in the nineteenth century by European engineers Karl Benz and Emile Levassor who were working on automobile ideas. In 1886, Benz patented the first vehicle.

Everyone is familiar with the nursery rhyme "Mary Had A Little Lamb," but you may not be aware that it is based on a true storey. Mary Sawyer was her name. She was an 11-year-old girl from Boston who was accompanied to school one day by her pet lamb. In the late 1860s, she raised funds for an ancient church by selling lamb wool.

Charles Dickens was a bit of an outcast. Growing up in London during the nineteenth century exposed him to such grim realities as working-class life expectancy being twenty-two years old, half a million Londoners suffering and dying from typhus due to a lack of sanitation, 220 crimes being punishable by death, and nearly half of all funerals in London being held for children under the age of ten, the majority of whom had full-time jobs as labourers in 1839, when Dickens was 27.