Ancient peoples have been making glue from sap, vegetables and charcoal for thousands of years. There are many different formulations. -Before that, I would guess they had no easy ways of joining things.
Yes, many people do.
You can use white glue or super glue as well.
Either use a hot glue gun or some super glue.
If the glue was a good glue then you will damage the wood before the glue lets go. Glue goes into the pores of the wood and holds tight. Usually to separate the two pieces you would need to saw them apart. This would give you a smoother separation.
No, you cannot use a solder gun as a hot glue gun.No, you cannot use a solder gun as a hot glue gun.
People who do it usually use glue sticks or Aleenes glue.
Buttons.
bikes
benches
pickaxes
carriages
You can glue things faster and more easily with a glue gun than with a tube of glue (although I still use tubes, personally).
There is no record of who invented the first glue. It has been in use for thousands of years in different forms. Early forms of glue have been found in caves in Europe. The Greeks and Romans made extensive use of glues in tiling, much of which still exists today (so their glue was pretty good.) The early Egyptians used fish bone glue at least 5,000 years ago.
Fingernails!!
Brief case
horses or their feet.
wall sockets