Full Idea
It is always heat and only heat that distinguishes the past from the future.
Gist of Idea
Only heat distinguishes past from future
Source
Carlo Rovelli (Reality is Not What it Seems [2014], 12)
Book Reference
Rovelli,Carlo: 'Reality is Not What it Seems', ed/tr. Carnell/Segre [Penguin 2016], p.221
A Reaction
I can remember the past but not the future - so can that fact be reduced to facts about heat?