The Tanach is the Jewish Bible. It is read from in synagogue, in the home, people study it on a daily basis.A Tanakh is the bible. It's a Hebrew acronym for Torah, Nevi'im (Prophets), and Ketuvim...
'tah-NAKH' is a Hebrew 3-letter acronym, formed by the initial letters of the Hebrew words for
-- Torah
-- Prophets ('neh-VEE-ihm')
-- Writings ('kheh-TOO-vihm')
So it's just the top-level...
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 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...