Cocoon features a ported enclosure and a built-in, 2-way speaker system with dual-layer woofers for resounding low frequency response.

ENGADGET: Denon intros Cocoon Home and Portable AirPlay docks, will transform songs into musical butterflies

"The presence of armed security personnel in a school adds a layer of security and diminishes the response time that is beneficial to the overall security, " said Asa Hutchinson, a former Republican congressman who led the NRA task force that developed the report.

BBC: NRA calls for armed guards in US schools

The sea ice expanded during Southern Hemisphere autumn and winter in response to the development of a fresh, cool surface water layer, which floated on the denser, warmer salty sea water below.

BBC: Melt may explain Antarctica's sea ice expansion