RIO DE JANEIRO — The debate over gun control is entering uncharted waters in Brazil, where for the first time anywhere in the world, a proposed ban on gun sales will be put directly to voters. Sunday's referendum follows an ambitious gun buyback scheme last year that prompted people to turn in more than 420,000 weapons ranging from antique rifles to semiautomatic assault weapons. Gun homicides fell by 8 percent the following year, marking the first drop in 13 years,... (GunPolicy.org)