It came as a shock.
Pushing to new levels of work, possible in youth, is hard to achieve and sustain with age.
A human body will last 90 years, give or take.
Similarly, energy from the earth and sun are finite.
Some forms of energy have a shorter lifetime than others.
The sun will not run out of fuel anytime soon. Yet eventually it will.
It serves us to notice our energy levels as they change.
Are you working on the important when your energy is high?
Which projects deserve your finite energy?
Image NASA