The last of these three is one of the densest books I've read in a very long time but also one of the most transformative in my understanding of numerous topics. It's so dense that I would recommend reading it even if you read only the first half and then find it simply too tough going after the first half.
It says how long ago something was said, so you can tell last month
from 2014 without doing the arithmetic. Full and green is recent; it
drains and cools as the date gets older, and empties completely at about
6 years.
6d5 days ago
8mo8 months ago
2yr2 years ago
4yr4 years ago
9yr9 years ago
A striped bar means the date itself is an estimate — the source did
not carry an exact one. An entry with no date at all gets no bar.