It was a big ol’ march. The first protest I went to was the Stop the War march in 2003 and it was similarly large. That one, all the ones in between, and probably this one, have been pretty much completely ignored. I think it is true that only direct action brings meaningful change. But movement building is helpful. (Also.. my preference would be to revoke article 50.)
A circuit made from lemons, copper coins and galvanised nails. Lighting up a low-current LED.

The copper and zinc are electrodes, amd the lemon juice is an electrolyte. The acid in the lemon juice reacts chemically with the zinc and liberates electrons. These flow to the copper. Three of these electrochemical batteries in series is enough to light a low-current LED.

I mean this stuff is like woahhh. Absolutely fascinating!

A 9V battery, some test leads and croc clips, a resistor and an LED. I am way more excited about this LED lighting up than perhaps I would have expected to be. This is loads of fun.

I’m even enjoying measuring the resistance of resistors with the multimeter and cross-checking against the reading from the coloured bands.