work you've done. lonna hall, thank you. dr. safi madain, thank you as well. hard not to remember that horrible day in 1999 when the columbine national shooting became a tragedy played out on national television. up next, i'll speak with "columbine" author david cullen about these scenes we see repeated far too often. ♪ ♪ (baby crying) ♪ ♪ don't juggle your home life and work life without it. ♪ ♪ and don't forget who you're really working for without it. ♪ ♪ funding to help grow your business... ♪ ♪ another way we have your back.