Help! What's that word?

There's a word for this, and it's escaping me entirely: where you have a device that echoes but massively multiplies the effect of your own movement, so that you twitch a finger and a steel bar gets bent. What is that word, O internets...?

Sick and sicker

K and I are competingly ill today. Things are worse for her, so I have to make more fuss to compensate. Still:

 

4292 / 95000 words. 4.5% done!

If I write one per cent a day, I'll be done in a hundred days. That's science, that is. (Bizarrely, today I wrote the exact same number of words - 967 - as I wrote yesterday. I'm sure it must Mean Something.)

Also, the lawyer has sent in the paperwork on our petition for a fiance visa. The govt now knows the worst. Eek.