The control of fire was the first and perhaps greatest of humanity’s steps towards a life-enhancing technology.
To early man, fire was a divine gift randomly delivered in the form of lightning, forest fire or burning lava. Unable to make flame for themselves, the earliest peoples probably stored fire by keeping slow burning logs alight or by carrying charcoal in pots.
hu‧man‧i‧ty /hjuːˈmænəti/ noun
Humanity is not used with ‘the’ in this meaning. You say:
• The future for humanity is uncertain.
✗ Don’t say: The future for the humanity is uncertain.
If you describe something as life-enhancing, you mean that it makes you feel happier and more content.
...a life-enhancing and exciting trip...
His letters, like his poetry, are life-enhancing and a delight.
How and where man learnt how to produce flame at will is unknown. It was probably a secondary invention, accidentally made during tool-making operations with wood or stone. Studies of primitive societies suggest that the earliest method of making fire was through friction. European peasants would insert a wooden drill in a round hole and rotate it briskly between their palms This process could be speeded up by wrapping a cord around the drill and pulling on each end.
whenever one wants; freely.
The soldiers were told to fire their guns at will.
You can eat anything you want at will.