School shootings: what can be done to stop them? 

The children of Robb Elementary School in Uvalde had just taken part in an end-of-term awards ceremony when 18-year-old Salvador Ramos entered the school at 11.33am through an unlocked back door. He was carrying an assault-style rifle and hundreds of rounds of ammunition. “It’s time to die,” he told the children in two adjoining classrooms…
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