Professional Nerd
My physics training went as far as A-level, but my interest continues.
To me, physics is the science of everything. It could be argued that everything is on-topic here ;-).
Useful links (not mine):
Handle History
For my first few months on the SE network I was AtomicToothbrush. That was kind of meaningless. I soon changed that to DigitalTrauma. I like the double meaning.
Avatar History
- First auto-generated avatar:

- The unicoin theme for April 1st 2014 was fun, so I used a screengrab of that for a few days:

- Then I hit upon this one which should be instantly recognisable to anyone who has spent more than a couple of minutes participating on any SE site. It has a certain positivity to it:
