If you need collaboration you can self-host collabora for free. https://www.collaboraoffice.com/code/ It uses libreoffice code. It’s also a supported backend for collaboration in nextcloud.

Some Roku remotes support this. You issue the command from the mobile app

This exists. https://www.libreoffice.org/ Great stuff 👍

Not sure what counts as ‘regular’ circulation. But there’s a Canadian ‘toonie’ in circulation that has a glow in the dark Aurora on it. https://www.google.com/amp/s/www.cnbc.com/amp/2017/06/27/canada-released-glow-in-the-dark-coin-150-year-anniversary.html

The Mercury is in a glass tube with two wires and the tube is attached to the bimetallic strip in such a way that the motion of the Mercury due to gravity as the strip moves will close the circuit between the two wires. The Mercury is just being used a liquid conductor.