Ever wondered why ♂ and ♀ represent the male and female gender?

The symbols are actually astrological in nature. The male is the celestial symbol for Mars. It is supposed to resemble a shield and a spear, because they're closely associated with Mars, the god of war. 

The female is the celestial symbol of Venus, who is the Roman godess of love, beauty and sex. There is less consensus over what this symbol represents, but one of the most popular explanations is that it represents Venus' hand mirror. Curiously, though, the symbol for Mercury, the winged messenger, is used to represent a virgin female. It basically looks like the venus symbol, with horns, take a look here.

If you're old enough to remember, there was a series of books called "Men are from Mars, Women are from Venus." Now you know the reason why the book was called that.

(Source) 

There’s a lake in Indonesia that has the same pH value as car battery acid!

The Kawah Ijen Lake is located in a crater. The lake is the largest sulfuric acid lake in the world. The actual pH level in the lake is 0.5! As soon as you put an aluminum can in the acid it begins to sizzle and bubble. Within 20 minutes the material is eaten away to the point of it being as thin as tissue.

Despite the dangerous situation, there are people who actually work here. The crater happens to be a sulfur mine. Miners collect and carry huge loads of pure sulfur up from the crater floor.

The miners receive roughly $10 a day for their work in the hazardous environment. Clouds of sulfur dioxide gas are all over the area, and it's considered one of the most dangerous places in the world to work in. 

Check out more pics in the source

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New Zealand’s only native mammals are two species of bats and a few swimming mammals!

Most of the wild mammals living in New Zealand were actually introduced by humans. The only exceptions are a couple species of bats and a few species of swimming mammals, like sea lions. These other mammals are seen as pests. They include goats, deer, pigs, rabbits, weasels, ferrets, and the Australian opossum. 

Pacific Islanders first came to the island sometime before 1300, bringing a species of rat with them, and domesticated dogs. Europeans later brought in pigs, ferrets, cattle and other mammals. A few of these imports have driven some of the native New Zealand species to extintion. In recent years, there has been an effort to remove some of the most harmful mammals from the island, in order to return the ecosystem to something that resembles the island's original state. 

New Zealand has no snakes and only one poisonous spider called the Katipo. The Katipo is related to the Australian Redback and its bite is never lethal. The country’s most unusual animal is the Tuatara which is a lizard like reptile known as a living fossil.

(Sources 1, and 2) 

There’s a product that literally smells like a woman's private parts!

Believe it or not, it exists. It's called Vulva Original, and they market it not as a perfume, but as a scent that people are supposed to apply one or two drops at a time. 

They market the product as both for men and women, to use for different types of purposes. It costs 24.50€ per vial. Though they assure that they follow strict terms of reference in the cosmetic insdustry, all they reveal is that it contains real organic parts. 

If you're not weirded out yet and you're not a minor want to learn more about this, go to the site to get more info.

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‘The Game’ was invented in 1976 by members of the Cambridge University Science Fiction Society!

We're sorry to make you lose the game so you can learn about where it started. The Game is one of the simplest distortions of game logic ever invented. Simply thinking about The Game causes one to lose. Due to the futility of The Game and the inevitable loss, The Game can be seen as a statement of the human condition.

The Game results in a double negative, where by trying to not do something one ends up doing exactly the thing they were trying not to do. It came about through discussions by the Cambridge University Science Fiction Society on game theory. This information is from The Game's official site, but take it with a grain of salt.

• It seems to have started as a variation of a Tolstoy passage where he describes someone tasked with someone not thinking about a white bear
• Then came another one called "Finchley Center," in which two people name London Underground stations. The winner of the game is whoever says Finchley Center first. Doesn't make much sense right? 
• In 1976, a variant was created in which the first person to think of Finchley Center loses. This is the first official variant of The Game.
• The Game later made an appearance in a 2002 blog by Paul Taylor of West Midland. Once it made it onto the Internet, the simplicity of its concept and execution made it really viral and took the life it has today.

Check out the official website for The Game (source 1) that gives you tons of time wasters so you can avoid thinking about The Game

(Sources 1, and 2)