Reading distressing news long past the point of use. The feed has no end by design, so a stopping point decided beforehand works far better than willpower ever does.
The drawing that proves the sentence above. It is the same card that is in the book.
Think of it as
picking at a scab because it's there.
For example
You look at the news for two minutes before bed and put the phone down forty minutes later, feeling worse and knowing nothing new.
This is one card out of 275.
The hundred words you meet most are free — the whole set, animated, in one file that works with no internet.
Volume 1 has all 275 in fifteen chapters, with Staying Safe the largest chapter on purpose.