Electronics/Expanded Edition Afterword

Electrolysis
Description, Faraday's rule, battery in reverse, maybe fuel cells

Ultra high frequency AC
Show how things change at ultra high frequency, wires becoming waveguides. This points the way to unification of electricity and radio.

Maxwell
Math free description, ubiquity of EM

Quantum stuff
Math free

Computers
Path from small circuits to PCs

Final word
Math free piece on how electronics fits into the wider scheme