After taking heat from the ACLU and being hacked by Anonymous for shutting down cellphone service to four stations last week, the Bay Area's BART kept cell service on during Monday protests.
From Milwaukee to Philadelphia to Chicago, officials are enforcing curfews and requiring chaperones for teens, after several flash mob attacks allegedly involving black youths.
'Flash robs' take social-media driven 'flash mobs' into new and dark territory, using Twitter and Facebook to organize thefts. It's a sign of how the Internet can reshape criminal behavior.
The stealthy predator Mnemiopsis leidyi uses tiny hairs to render itself hydrodynamically invisible as it closes in on its next meal.