Case file · High strangeness
Zöllner and the medium Slade
In 1877, Leipzig astrophysicist Johann Zöllner tested the American medium Henry Slade and concluded that knots tied in sealed cords proved a fourth dimension.
1877 CE · 51.34, 12.37 · status: hoax
The sceptical view
Slade had been exposed as a cheat in London in 1876; critics found Zöllner's controls weak.