She was shot in the chest as Kristian's mother went outside to feed their dogs, authorities said.

BBC: Kentucky boy, 5, shot dead sister, 2, with child gun

This is not simply because sophisticated sniffing machines are less sensitive than dogs' noses or because prison teaches young addicts new crimes to feed their habits.

ECONOMIST: Round and round the coca bush

Convenience is part of this: There's little preparation, it doesn't take long to cook, you can feed a lot of kids in a hurry with a few packages of hot dogs, and the kids usually don't mind if you burn or drop a few.

NPR: For Many This Weekend, The Grill Offers A Thrill