“Only one important thing has happened in the last three days, and that is that nothing has happened.” – Sherlock Holmes

“Physicians often pride themselves on curing all their patients with a remedy that they use. But the first thing to ask them is whether they have tried doing nothing, i.e., not treating other patients; for how can they otherwise know whether the remedy or nature cured them?” – Sherlock Holmes

Negative evidence and events that don’t happen, matter when something implies they should be present or happen.

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