My son was born somewhat late in my life and I just found myself really feeling like I didn't want to miss out on being a parent and being with him, and not wanting a situation where I was constantly pulled back and forth between being present, and having all these other pressures and considerations
For example, a breakthrough in better batteries could supplant hydrogen. Better solar cells could replace or win out in this race to the fuel of the future. Those, I see, as the three big competitors: hydrogen, solar cells and then better batteries.
The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as we continue to live.

