Another school shooting: The deceased victims were 14-year-old Mason Schermerhorn, 14-year-old Christian Angulo, and Richard Aspinwall, 39, and Christina Irimie, 53. The school’s website shows the two adults were both math teachers and Aspinwall was also an assistant football coach. and the arrest of a 14-year-old suspect follow a familiar pattern of previous school shootings. After every one, there's been a tendency to ask, "How do we prevent the next one?" For years, school safety experts, and even the U.S. Secret Service, have rallied around some very clear answers. Here's what they say. It's not a good idea to arm teachers There's broad consensus that arming teachers is not a good policy. That's according to Matthew Mayer, a professor at Rutgers Graduate School of Education. He's been studying school violence since before Columbine, and he's part of a group of researchers who have published several position papers about why school shootings happen. Raise age limits for gun ownership School safety researchers support tightening age limits for gun ownership, from 18 to 21. They say 18 years old is too young to be able to buy a gun; the teenage brain is just too impulsive. And they point out that the school shooters in Parkland, Santa Fe, Newtown, Columbine and Uvalde were all under 21. What can we do?  Schools can support the social and emotional needs of students. A lot of the conversation around making schools safer has centered on hardening schools by adding police officers and metal detectors. But experts say schools should actually focus on softening to support the social and emotional needs of students.