Researchers at the Technological University of Denmark have announced the creation of another solid-state form for storing hydrogen. In this scheme, which differs significantly from hydride storage techniques, ammonia is absorbed into a tablet of sea salt in what appears to be a twist on the ammonia borane concept. The ammonia would be released from the salt in some unspecified manner (through heating, perhaps), and when passed over a catalyst, it would release hydrogen. This would result in a relatively safe way to store energy, without high pressures or risk of fire or explosion. Ammonia is already one of the most common industrial and agricultural chemicals (not to mention its popularity with meth producers), and some feel strongly that it's suitable for use as an energy storage mechanism. A thank-you goes out to our reader sine~language for the tip.