Husband-and-wife team William Firth Wells and Mildred Weeks Wells conducted research that had the potential to make a big difference in the safety of indoor air. But it didn’t really have a significant impact on public health.
Research:

Behind the Scenes Minis: Self-talk Hoax
19:57

The Pompey Stone Hoax
35:25

Émile Coué and Autosuggestion
39:52