People train and arm the teachers, put double security doors at the entrances....exits are one way STEEL doors. with peep holes or cameras. and if you want hire an armed guard under the current astronomical DOE budget. People criticize NASA funding, but it has actually declined significantly over the years where as the DOE budget has increased exponentially and with what results? Subpar reading and math skills? Where as NASA (and the Commercial Contractors) have put man on the moon, sent Satellites deep into space, built a space station, an Atmospheric Telescope providing images for other galaxies we can only dream of going to, and contributed thousands of new inventions and technologies that mankind has and continues to benefit from.