And in science news, a new study shows one of the world’s most commonly used weed killers can turn male frogs into females. The chemicals in the weed killer atrazine disrupt development and make frogs develop both male and female features. The European Union banned atrazine in 2004, but the weed killer is still widely used in agriculture here in the United States. Researchers said approximately 80 million pounds of atrazine are applied annually in the United States alone. Atrazine is now the most common pesticide contaminant of ground and surface water.