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The massacre of 26 worshipers at a rural Texas church is the latest in a grisly series of mass shootings across America in recent years.With each tragedy, we hear arguments about gun violence, mental health, how much firearms should be regulated and what’s driving the prevalence of mass shootings. PolitiFact has worked for years to research these topics to help explain talking points used by all sides of the debate.Here are some answers to some questions you may have.How do we define mass shootings?There is no widely accepted definition of mass shootings. People use either broad or restrictive definitions of mass shootings to reinforce their stance on gun control.Researchers at the nonpartisan Congressional Research Service defined "mass shooting" as "a multiple homicide incident in which four or more victims are murdered with firearms, within one event, and in one or more locations in close proximity" in a 2015 report. They counted 317 mass shootings from 1999-2013.The report also used the term "mass public shooting" for a multiple homicide incident in which four or more victims are murdered with firearms, within one event, in at least one or more public locations, such as a workplace, school or house of worship. There were 66 attacks that met that definition during that 15-year period.After the 2012 Sandy Hook school shooting, Congress defined "mass killings" as three or more homicides in a single incident. The definition was intended to clarify when the U.S. Attorney General could assist state and local authorities in investigations of violent acts and shootings in places of public use.The Gun Violence Archive tracks gun deaths using media, law enforcement, government and commercial sources. Its data is based on a broader criteria: at least four people injured or killed in one location, not including the suspect. Criminologists previously told?PolitiFact that this group’s tally includes gang shootings and home invasion robberies.When is a mass shooting in the United States considered terrorism?A mass shooting needs to meet several criteria in order to be legally labeled as domestic terrorism. That definition applies to acts dangerous to human life that are a violation of U.S. or state criminal laws, which occur primarily within U.S. territorial jurisdiction and appear to be intended to: 2388

The new romaine lettuce recall is causing many to change up their Thanksgiving Day menus.A popular vegan restaurant and catering company, Pianta, is one place affected by the recall.“We use romaine every day,” says restaurant owner Michael Moon. “We use about two to three cases of romaine every week, so it's pretty significant.”The restaurant has thrown out all of its romaine lettuce.“Essentially, we're just throwing away money,” Moon says.However, Pianta’s owner says it’s only a small cost to pay for the safety of his customers.“We don't want to be associated with some sort of outbreak here as a plant-based restaurant. It's scary.”Until further notice, the Centers for Disease Control and Prevention (CDC) is warning everyone to throw out any and all romaine lettuce. That includes prewashed bag lettuce, as well as any other foods stored with it or touching it.Health officials also to clean out your refrigerator and counter.Moon says the recall is scary, because this is just the latest recall impacting his vegan, plant-based restaurant.“We've seen this with spinach; we've seen it with romaine; we've seen it with kale,” Moon says. “So, for someone like us, it's sort of the bedrock of what we're doing here, so it's obviously a big concern.The CDC is trying to find the source of the E. coli outbreak, which so far has sent dozens of people to the hospital, both in the United States and Canada. 1418

The news of the Detroit Tigers Opening Day being postponed was a disappointment for many, but one 3-year-old was especially upset. Harper, who watches Tigers games with her mother, Ashley Aichler, was in tears over the fact that she wouldn't get to see the team "play ball" on Thursday.Watch the full video above, taken by Harper's grandmother Dianna Canupp.  377

The National Rifle Association will host its annual convention this weekend, and on the first day of the convention, firearms will be barred from entering the Dallas facility hosting the NRA. According to a bulletin from the United States Secret Service, firearms, along with knives, laser pointers and a variety of other items will be banned from the facility. This is because Vice President Mike Pence is scheduled to appear on Friday. Civilians are generally prohibited from carrying weapons when the Vice President or President is present, and a meeting of the NRA is no exception. "Due to the attendance of the Vice President of the United States at the NRA-ILA Leadership Forum on Friday, May 4, the U.S. Secret Service will be responsible for event security around the Arena at the Kay Bailey Hutchison Convention Center," a statement on the NRA's website said. "As a result, firearms and firearm accessories, knives or weapons of any kind will be prohibited in the forum prior to and during his attendance"CNN is also reporting that President Donald Trump will attend on Friday The firearm ban only extends for Friday's sessions, and not for Saturday or Sunday.Some survivors of the Parkland, Florida school shooting, and backers of the March for Our Lives movement said it is hypocritical that a group that decries gun control regulations won't be allowed to have its members carry weapons. "The NRA has evolved into such a hilarious parody of itself," Stoneman Douglas High School student said on Twitter in response to the weapon ban announcement. Leaders of the March for Our Lives have made the NRA a target of theirs, decrying politicians who accept campaign contributions from the group. "Wait wait wait wait wait wait you’re telling me to make the VP safe there aren’t any weapons around but when it comes to children they want guns everywhere?" Matt Deisch, leader of the March for Our Lives campaign, and a former Stoneman Douglas high school student, said on Twitter. "Can someone explain this to me? Because it sounds like the NRA wants to protect people who help them sell guns, not kids."A petition calling for Pence to cancel his appearance at the NRA convention has drawn nearly 45,000 virtual signatures. A similar firearm ban was enacted at last year's NRA Leadership Forum due to Trump's attendance.  2405

The people of El Paso, Texas, are resilient. Living in the middle of the harsh Chihuahuan Desert, the city has no other choice. On average, 15 days every year spike over 100 degrees Fahrenheit. The city gets little relief with annual rainfall of just about 9 inches. It's one of the hottest cities in the country.One of its prime sources of water is the Rio Grande. Typically the river can supply as much as half of the city's water needs. But climate change is making that increasingly difficult and is pushing the city to look for new sources of water. Now, El Paso is on track to become the first large city in the United States to treat its sewage water and send it directly back into its taps.Increasing temperatures will make the dry region even more vulnerable to drought, according to the federal government's most recent national climate assessment. Already challenged with balancing the demands of about 700,000 thirsty El Pasoans along with agriculture and industry needs, El Paso must also face the fact that climate change is literally drying up one of its major sources of water.Analyzing tree ring records, scientists have been able to reconstruct the climate history of the region as far as the late 1500s and have found that as temperatures have risen, the amount of snow melting and feeding the Rio Grande has dropped."We're getting less runoff now than we would have gotten as recently as the '80s or '90s," said J. Phillip King, a professor of civil engineering at the University of New Mexico. King has tracked the river's water levels for the past 27 years as an adviser to the Elephant Butte Irrigation District. The district manages the water distribution of some 90,000 acres of farmland along the Rio Grande Valley in New Mexico and Texas.King told CNN Chief Medical Correspondent Dr. Sanjay Gupta that there is simply less snowmelt coming from northern New Mexico and southern Colorado to feed the river. Since 1958, the amount of early April snowmelt going into the Rio Grande has dropped 25% due to less snowpack and evaporation.What's happening in the Rio Grande is not unique. It's a phenomenon happening throughout the Western United States.King called the Rio Grande a harbinger of what's to come. "You know we've already gotten critically low here, and you can think of the Colorado as a few years away from a similar fate," he said.Drought isn't anything new for the 1,800-mile long river. The Rio Grande has survived severe and sustained droughts, King said. But an increase in temperature is pushing both a warmer and dryer climate. And that means not only potentially less snowfall but a greater chance for water to evaporate.The federal government projects that temperatures could rise an additional 8 degrees Fahrenheit in the region by 2100.The dwindling reserves are apparent at Elephant Butte Reservoir, just outside of Truth or Consequences, New Mexico. The reservoir there sits right on the Rio Grande and forms the largest recreational lake in the state. It holds water for farmers from north of El Paso up to Colorado. It has a capacity of about 2 million acre feet, King said. Currently, it's hovering around 3% to 4% of its full capacity. Buildings that were built as offices during the dam's construction in the early part of the 20th century were previously submerged in the 1980s. Now, they serve as lookout points to a nearly empty basin. 3399