Learning new things.
I realised what that feeling was when I look up at the stars, see a mountain vista, watch the ocean...... In the presence of such apparent infinity we appear so very finite. The subconscious triggers fear, awe and motivation all at once. Time is precious.
I know I will die with questions about the universe that will never be answered. We will possibly know those answers some day and we will all be gone. This post may remain somewhere but we will not.
This all motivates me to learn as much as I can. I am intrigued by the questions and get excited by the answers.
Geek basically!