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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

The United Kingdom's second-biggest airport has been closed on one of the year's busiest days for travel after drone sightings, which police have described as a "deliberate act."London's Gatwick Airport has been closed since 9 p.m. on Wednesday -- bar a brief reprieve of 45 minutes early Thursday -- after drones were spotted near the airfield.Passengers due to fly on Thursday evening or Friday were being told not to go to the airport without first checking the status of the flight with the appropriate airline. An airport spokesman tells CNN this is because it may take a while for airlines to get adequate planes to Gatwick to transport affected passengers.Police were still on the hunt for the drone operators who have brought the airport to a standstill, causing travel chaos for hundreds of thousands of passengers just days before Christmas."Each time we believe we get close to the operator, the drone disappears; when we look to reopen the airfield, the drone reappears," Sussex Police Superintendent Justin Burtenshaw told the UK's Press Association.The Ministry of Defence said that it had deployed specialist equipment to assist Sussex Police in their efforts.A drone had been spotted near the runway as recently as midday, airport Chief Operating Officer Chris Woodroofe told journalists. He could not say when the major international airport, located south of London, would reopen.The chief executive officer of the airport, Stewart Wingate, said he hoped passengers would appreciate that officials were prioritizing their safety."I would like to repeat how sorry we are for the inconvenience this criminal behaviour has caused passengers and we share their real anger and frustration that it has happened," he said.Aviation expert Jon Parker told CNN he'd "seen nothing on this scale before," in terms of deliberate disruption by a drone to a major UK airport."The usual practice (when a drone is spotted) is to suspend flights for half-an-hour, which is the usual battery lifespan for drones," explained Parker, a former Royal Air Force fighter pilot and head of drone training company Flyby Technology.But in the case of Gatwick, "whoever is responsible for this has had several batteries and have brought their drones back to the ground to put new batteries on them," he said.It is illegal to fly drones within 1 kilometer (0.6 miles) of a UK airfield boundary, with perpetrators facing up to five years in prison.There is no indication the incident at Gatwick is terror-related, 2512

There is a large police presence at the South Florida home of former NFL star wide receiver Antonio Brown on Tuesday afternoon.Multiple police cruisers have responded to Brown's residence in Hollywood. 213

The US-backed Syrian Democratic Forces (SDF) captured two Americans in Syria who are suspected of being ISIS fighters, the militia said in press release Sunday.The militia identified the men as Warren Christopher Clark (Abu Mohammad al-Ameriki) and Zaid Abed al-Hamid (Abu Zaid al-Ameriki).The SDF said Clark is originally from Houston, but it gave no specific location in the United States for the other man's origin.The Americans were captured in a group that also contained fighters from Ireland and Pakistan, SDF said.A Pentagon spokesman said the incident is under investigation."We are aware of open source reports of reportedly American citizens currently in custody who were believed to be fighting for ISIS. However, we are unable to confirm this information at this time," Commander Sean Robertson said.The White House announced last month that ISIS had been defeated in Syria and the United States would withdraw 2,000 troops from the war-stricken nation.In October, the US military 1006

The skydiving plane that crashed Friday in Hawaii, killing all 11 people on board, was in another accident in California in 2016, according to National Transportation Safety Board records.The Beechcraft 65, manufactured in 1967, was being used as a skydiving plane as well on July 23, 2016 with 15 people on board when it stalled in the air three times and spun out before the pilot was able to land it. The 14 passengers on board, parachutists, were forced to jump to safety in mid-air.There was substantial damage to the tail section of the plane in the 2016 incident, but that wouldn't have precluded it from ever flying again, NTSB member Jennifer Homendy, who is in Hawaii investigating Friday's crash, said at a news conference Sunday afternoon.The cause of the 2016 incident was determined by the NTSB to be pilot error."The pilot lost control of that aircraft and there was substantial damage to the tail section of that plane. But like other modes of transportation you would conduct repairs and make sure that that is inspected," Homendy said. "So we will be looking at the quality of those repairs and whether it was inspected and whether it was airworthy before it was returned to service."In the more recent incident, the plane went down shortly after taking off from the Dillingham Airfield on Oahu's North Shore.The small plane, which was carrying passengers who intended to skydive, crashed around 6:30 p.m. Friday and erupted into flames. There were no survivors and authorities have not released the names of the people killed.Friday's crash is the deadliest civil aviation crash since 2011, Homendy said.On Sunday, she said officials were on the island to conduct their investigation and move "perishable evidence" into a safe location for inspection. Investigators have not yet determined a cause for the crash, she said.The plane did not contain a black box, Homendy said.The airfield where the plane crashed is roughly a 35-mile drive northwest of Honolulu. The general aviation airport is operated by the state Department of Transportation under a 25-year lease from the US Army, Hawaii's government website says. 2148

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