Air pollution from oil and gas is causing 91,000 premature deaths and hundreds of thousands of health issues across the United States annually, with Black, Asian, Native American and Hispanic groups consistently the most affected, finds a major new study led by researchers at UCL and the Stockholm Environment Institute (SEI).

While 42 states require public school students to take a sexual education course that covers at least one topic within this subject between kindergarten and high school, only 19 states mandate that this instruction be medically accurate—and 5 of those states only require medical accuracy for specific topics, according to a new study in the American Journal of Public Health. The study also found that 34 states that mandate sexual education in public schools require instruction on abstinence, a method that has consistently proven to be ineffective or harmful to adolescent sexual health, but continues to be embraced and funded by the federal government. Thirty-four states also allow parents to opt their children out of receiving any sexual education instruction, while five states require parents to opt in for their children to receive this instruction.