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Math enthusiasts know all about it, and the rest of the population is probably hoping for cherry pie.But March 14 is Pi Day. While last year stretched the symbolic celebration out a little longer -- to 3.1415 -- each year presents ample opportunity for learning.To 31 decimal places, the celebrated irrational number that never ends is 3.1415926535897932384626433832795.A few more tidbits about pi and Pi Day:About piPi is the ratio of the circumference of a circle to its diameter. It's not equal to the ratio of any two whole numbers, so an approximation -- 22/7 -- is used in many calculations.Pi is essential in architecture and construction and was used frequently by early astronomers. Pi has been known for about 4,000 years, but it started to be called by the Greek letter only in the 1700s.The origin of Pi DayPi Day started 30 years ago at San Francisco's Exploratorium.Physicist Larry Shaw, who worked in the electronics group at the museum, started celebrating pi on March 14, 1988, primarily with museum staffers. The tradition has grown to embrace math enthusiasts from all walks of life.For more about pi, visit www.piday.org. 1159

MEXICO CITY (AP) — About 750 Central American migrants headed out of Mexico City on Friday to embark on the longest and most dangerous leg of their journey to the U.S. border, while thousands more were waiting one more day at a massive improvised shelter.The group that got a head start bundled their few possessions and started off, taking a subway to the north part of the city and then hiking down an expressway with a police escort.For many, it was the first time they had ever been in a metro system, and they had little knowledge of the city or the 1,740 mile (2,800 kilometer) route to Tijuana that lay ahead of them.RELATED: Interactive map: Migrant caravan journeys to borderCarlos Castanaza, a 29-year-old plumber from Guatemala City, wrapped himself from head to toe in a blanket against the cold and asked bystanders where the first toll booth was. When told it was in a town about 20 miles (30 kilometers) away, he carefully wrote the name of the town on his hand with a pen to remember where he was going.Deported for driving without a license after a decade working in Connecticut, Castanaza was desperate to get back to his two U.S.-born children. "I've been wanting to get back for more than a year, but I couldn't until the caravan came through," said Castanaza. "That's why I joined the caravan."The advanced group hoped to reach the north-central city of Queretaro, about 105 miles (170 kilometers) to the northwest, by nightfall.PHOTOS: Migrant caravan moves through MexicoMeanwhile, another 4,000 to 5,000 migrants milled around the massive shelter improvised at a Mexico City sports complex, impatient to leave."Let's go, let's go!" shouted Eddy Rivera, 37, a rail-thin migrant from Honduras who said he couldn't take staying in the camp any longer. "We are all sick, from the humidity and the cold," said Rivera, who left behind four children and a wife in Honduras. "We have to get going, we have to get to Tijuana."Though he was unsure how an unskilled farmworker like himself would be allowed in the United States, he had a simple dream: earn enough money to build a little house for his family back in Puerto Cortes, Honduras.RELATED: Timeline: Migrant caravan journeys to U.S.-Mexico borderThousands of migrants have spent the past few days resting, receiving medical attention and debating how to proceed with their arduous trek through Central America and Mexico which began in mid-October. On Thursday, caravan representatives met with officials from the local United Nations office and demanded buses to take them to the border, saying the trek would be too hard and dangerous for walking and hitchhiking.Caravan coordinator Milton Benitez said officials had offered them buses for women and children but organizers demanded that they be for everyone. By Friday, the migrants said they were so angry at the U.N.'s lack of help that they no longer wanted U.N. observers with the caravan.The United Nations on Friday denied the offer, releasing a statement saying its agencies "are unable to provide the transportation demanded by some members of the caravan."The migrants made a big point of sticking together, their only form of self-protection.Felix Rodriguez, 35, of Choluteca, Honduras had been at the Mexico City sports complex for more than a week."We all want to get moving," he said. But he was waiting for the main group to leave Saturday, noting "it is better to leave in a group, because leaving in small bunches is dangerous."Mexico City is more than 600 miles from the nearest U.S. border crossing at McAllen, Texas, but the area around the Mexican border cities of Reynosa, Matamoros and Nuevo Laredo is so rife with drug gangs that the migrants consider it too dangerous to risk.A previous caravan in the spring opted for the longer route to Tijuana in the far northwest, across from San Diego. That caravan steadily dwindled to only about 200 people by the time it reached the border."California is the longest route but is the best border, while Texas is the closest but the worst" border, said Jose Luis Fuentes of the National Lawyers Guild.Mexico has offered refuge, asylum or work visas to the migrants, and its government said 2,697 temporary visas had been issued to individuals and families to cover them while they wait for the 45-day application process for a more permanent status. On Wednesday, a bus left from Mexico City to return 37 people to their countries of origin.But many want to continue on toward the United States.Authorities say most have refused offers to stay in Mexico, and only a small number have agreed to return to their home countries. About 85 percent of the migrants are from Honduras, while others are from the Central American countries of Guatemala, El Salvador and Nicaragua. 4770

McDonald's will distribute 20 million packets of its highly sought Szechuan Sauce across every location in the U.S., starting today.It's an attempt to try and mitigate shortages of the dip popularized by fans of the TV sitcom "Rick and Morty." The sauce was originally released in 1998 as part of a promotion for the Disney film "Mulan," but faced massive demand after being referenced in a Season 3 episode of "Rick and Morty." 456

Michigan bars and restaurants must now collect names and phone numbers of customers for COVID-19 contact tracing under an extended epidemic order, the Michigan Department of Health and Human Services (MDHHS) announced today.Health officials said these are requirements and the businesses must operate under the rules to protect public health.The new provision was just one of the extensions of the epidemic order from the MDHHS aimed at helping contain the spread of the virus. Other extensions to the order include no more than 50 people at indoor gatherings without fixed seating, and no more than six people at seated tables at bars, restaurants, and indoor non-residential gatherings.The announcement from the MDHHS comes as Michigan continues to see a rise in cases and hospitalizations due to COVID-19.The state says there are currently 12 outbreaks in Michigan associated with bars or restaurants with currently active clusters up to 12 cases. Michigan presently has 172 cases per million people and positivity of tests has increased from about 2% to 5.5%, and both indicators have been increasing for over four weeks.This article was written by WXYZ. 1166

LUBBOCK, TX — A 9-year-old girl from Texas who has been missing since 2016 was found safely on Monday after the story of her disappearance was featured on the television show "Live PD".Mariah Martinez was last seen on October 18, 2016, when she was taken from her home in Lubbock, Texas.On Friday night, the A&E show had a segment that chronicled the events that led to Mariah's disappearance. According to Fox News, Mariah's mother, Amanda, was close to losing custody of her three children and decided to take them and flee instead of going to court.A court order was issued after Amanda’s boyfriend allegedly punched Mariah's 5-year-old brother in the nose and threatened to kill the family by driving their car into a pond.The Live PD segment explained that in January 2017, police were tipped off about the family's whereabouts. Police found Amanda and two of the children, but not Mariah.The mother was arrested on felony charges, but Mariah's whereabouts remained a mystery.The television program ended by asking viewers to contact the National Center for Missing & Exploited Children if they knew anything.NCMEC posted to Facebook on Tuesday that Mariah was found in New Mexico following a viewer’s tip.The Lubbock Police Department also released a statement saying they were thankful to NCMEC for helping find Mariah.  1398

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