Conterintuitive facts in mathematics, CS, and physics
> 6. Causation does not imply correlation: <a href="https://arxiv.org/abs/1505.03118" rel="nofollow">https://arxiv.org/abs/1505.03118</a><p>And in the paper, from the abstract,<p>> We demonstrate that the Faithfulness property that is assumed in much causal analysis is robustly
violated for a large class of systems...<p>In preliminaries,<p>> The Faithfulness assumption is that no conditional correlation among the variables is zero unless it is
necessarily so given the Markov property.<p>So probably a more accurate laymam description would be "not all causations are observable as a statistical correlation relationship".