Updated: 8:29 PM UTC, Jul 16, 2017

The Marathon Distance: 26.21875 miles (42.195 km)

The marathon is a long-distance running event with an official distance of 26 miles and 385 yards (42.195 km). In 1908, during the London Olympics, the royal family wanted the race to leave from Windsor Castle and to finish facing the royal box in the Olympic Stadium, which gave this distance.

Now I Know
831
I Knew it
554

John Kennedy Toole - A Successful Writer After His Death

John Kennedy Toole, a writer, was convinced at the age of 31 that he was a failure and committed suicide. After his death, and through the efforts of his mother, his book "A Confederacy of Dunces" was published and sold over 1.5 million copies. He even won the Pulitzer Prize in 1981. Toole's novels were always rejected during his lifetime.

Now I Know
950
I Knew it
536

Why Did Fabrice Santoro Use a Two-handed Grip?

Fabrice Santoro was one of the only professional tennis players to have a passing shot using both hands. He started playing tennis at the age of 6 with an adult's racket that was way to heavy for him. To compensate, he was forced to use both hands in order to play. The two-handed grip remained with him throughout his career.

Now I Know
829
I Knew it
563

The Two Color Rule in Table Tennis

The two color rule was initiated in July 1986, stating that one side of the racket rubber must be red and the other side black. This measure was introduced because of the increased use of "combination" rackets, notably during a European championship game when the winner had used a racket whose sides were both red.

Now I Know
779
I Knew it
313

Haagen Dazs - The American Version

You are probably a fan of the delicious Haagen Dazs ice cream. But did you know that it is a 100% American product, whose name was chosen to sound Scandinavian? The brand name was created in the Bronx by Reuben Matus in 1961.

Now I Know
882
I Knew it
361

Space Invaders Causes Drastic Shortage of 100 Yen Coins

Since the launch of the Space Invaders game in Japan in 1978, it has been so widely successful that the country has experienced a shortage of the coin needed to play the game in arcades. Atari, the producer of the arcade games, increased its profits twenty-fold due entirely to this game.

Now I Know
837
I Knew it
343

Dennis Bergkamp - The Non-Flying Dutchman

Dennis Bergkamp, a Dutch soccer player who was consistent star athlete for the Arsenal team, missed a lot of games. He suffered from a fear of flying, often preventing him from participating in away games, except when it was possible to travel by train or car to reach the match venue. His nickname was "The non-flying Dutchman".

Now I Know
724
I Knew it
473

Should You Wake Up a Sleepwalker?

You have probably heard that it is dangerous to wake up a sleepwalker. This is decidedly false, and it is at times preferable to wake the person up rather than let the individual face danger. Upon waking up, the sleepwalker may be disoriented, but will react as any other sleeper suddenly awakened.

Now I Know
622
I Knew it
428

Book Covers Made Of Tanned Human Skin

In the eighteenth and nineteenth century, some books, mostly dealing with medicine, were bound with a cover made of tanned human skin, which usually came from people on the death row. Today, you can still find copies sold to collectors for a fortune.

Now I Know
1015
I Knew it
307

Want to Print Your Own Money, Think Again!

Computer scanning and editing of bank notes is highly controlled in order to foil counterfeiting attempts. Adobe Photoshop and certain scanners have built- in counterfeit deterrence systems, resulting in a warning message popping up should you try to access a currency image. It is reputed that certain patches are available to bypass these security measures.

Now I Know
854
I Knew it
464

Discover Why The Forest of Landes (France) Is Considered Artificial

The forest at Landes, the largest in Europe, is not a natural one: in fact Napolean planted these coniferous trees as a measure to dry out the marshes in order to render the land more fertile, eliminate malaria, and anchor the dunes.

Now I Know
891
I Knew it
338

Why Do Butter Is Normally Darker In The Summer?

Butter is normally darker in the summer due to an increased presence of chlorophyll and carotene in the diet of cows. To maintain the same color of butter throughout the years, manufacturers sometimes add dyes. This dye is added so as not to disrupt the consumer. It is either carotene or a natural pigment.

Now I Know
947
I Knew it
807