BY THE NUMBERS: Every story can use supporting numbers, whether it’s being told to investors or family and friends. The US Census Bureau recently shared a series of “Back to School” stats drawing from census data from the past several years. Some bird’s-eye view highlights: 78 million children and adults were enrolled in a school in October 2013. Public schools spent, on average, $10,700 per K-12 student in 2013. across the country, an estimated 12 million children ages 5 to 17 speak a language other than English at home (8.5 million speak Spanish). And perhaps a more startling stat: 74 percent of people with a STEM bachelor’s degree were not employed in STEM occupations in 2012.