you want medium size chunks just blow apart modern extra strength safety glass ~
http://twitchy.com/2013/04/15/fox-news-boston-marathon-bombs-packed-with-ball-bearings/
WhiteHousePressCorps @whpresscorps
RT @passantino: Fox News reporting Boston Marathon bystanders saying they were struck by ball bearings during explosions
7:52 PM - 15 Apr 13