S4E3 - How tech works an A-Z guide - Metaphors F-J Technology and the Human Purpose

I am starting the season with an A to Z guide of how technology works using metaphors and the focussing device. In this show I cover F-J.
F is Flux capacitor
G is for gravity
H is for Holy Grail
I is for invention
J is for Jam
 A couple of recent shows worth listening to.
 BBC History Extra podcast : Benjamin Franklin: life of the week. Wherever you get your podcasts.
 BBC IOT Nikola Tesla https://www.bbc.co.uk/programmes/m001xvhb
 The intro and outro music is 'fantasy orchestra' available at https://freesound.org/
 Watch out for more information and connected content with each episode on the blog https://theology-and-technology.blogspot.com/