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Thursday marks Pi Day, otherwise known as 3.14, which marks the ratio of a circle's circumference to its diameter. While the average citizen can easily remember the 3.14 ratio, the exact ratio practically has an infinite amount of numbers. If you want a more precise pi ratio, it is 3.141592653589793238462643383279. How well do you think you could remember just those 30 digits? One man was able to remember the ratio of pi up to 70,000 decimal places. Rajveer Meena accomplished the feat on March 21, 2015 while wearing a blindfold. According to the Guinness Book of World Records, Meena's feat took nearly 10 hours to accomplish. According to Five-Thirty-Eight, there are now more than 22 trillion know digits to pi. According to Five-Thirty-Eight, it took a Dell computer nearly 105 days of computation to come up with the large number of digits. This is compared to just 2,000 known digits of pi in the mid-20th century. So how does one remember so many digits? Savant Daniel Tammet, who is able to remember pi's calculation to more than 20,000 digits, told David Letterman, "What I am doing is visualizing numbers." he said. "When you look at a number, you just see the numbers four and three. When I am looking at numbers, I am seeing different colors and shapes and textures. It is called 'synesthesia.' My brain is working in such a way I am looking and also experiencing color. It is two senses combined. "Having a more exact number of pi helps scientists at NASA conduct more precise experiments and calculations. Having more exact figures helps lend precision to projects such as landing rovers on Mars, sending spacecraft into deep space or tracking the movement of asteroids. To see many of the ways NASA uses pi, click 1746

Trooping guards with bearskin hats, guns blasting at the Tower of London and a spot of afternoon tea launched President Donald Trump's long-awaited state visit to the United Kingdom on Monday.The elaborate displays of hospitality did little to prevent Trump from dispatching insults over Twitter as he descended into London.It was an appropriate start to a visit laced with controversy and steeped in tradition, delivered by a fractured nation for a hard-to-please guest."I think it'll be very important," Trump predicted as he departed the White House on Sunday evening. "It certainly will be very interesting."Indeed, the dramatics began even before Air Force One had touched down at Stansted Airport outside London. As he was descending, the President tweeted an insult of London's mayor, calling Sadiq Khan a "stone cold loser" for being "foolishly 'nasty' to the visiting President of the United States."Trump and Khan have engaged in a transatlantic spat over terrorism and security, and this week Khan called Trump "one of the most egregious examples of a growing global threat" 1097

The suspect in the El Paso shooting reportedly admitted to the crime and told detectives that he targeted Mexicans in the shooting, according to the 161

TOWSON, Md. — Home videos capture images of Deborah Limmer and her 5-year-old granddaughter, Delaney Gaddis, which now serve as painful reminders of two lives lost, leaving the young girl's father searching for words to describe 241

The third Democratic primary debate, hosted by ABC and Univision, will take place on September 12.Presidential candidates had until late August to reach polling and grassroots fundraising thresholds 211

来源：资阳报