Human creativity, it seems, knows no bounds when it comes to inventing new ways to build a petroleum-based fire inside an enclosed metal space and then convert the resulting energy pulse into forward motion.

FORBES: Connect

The Guard Dog also speeds things up by letting you crank drives through a mechanism that'll wipe them as they pass through, even if they're enclosed in metal cases.

ENGADGET: Military-grade "Guard Dog" hard drive degausser

Dr Hondou examined mobile-phone usage in enclosed spaces such as railway carriages, buses and lifts, all of which are, in essence, metal boxes.

ECONOMIST: Are mobiles phones on trains dangerous or not?