This was used from the woman Mary , Lazarus sister, to annoint Jesus feet. It was spikenard from the Himalyaian mountains, its a herb with purple flowers. It was very fragrent, and worth a lot of money in those times.
In the King James version the word - spikenard - is used 5 times
Son 1:12 While the king sitteth at his table, my spikenard sendeth forth the smell thereof. Son 4:13 Thy plants are an orchard of...
The only answer that comes to mind is "Airships". Hydrogen, the lightest element, was used in airships, where excess weight was undesirable. However, accidents like the Hindenburg disaster showed...
A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)
The ancient Germanic tribes and the ancient Scandinavians used runes as an alphabet. Prior to that, they used runes for magic purposes, such as casting lots (divination) and spells of protection.