MUNICH, Germany, May 24 -- The Max Planck Society issued the following news on May 23, 2025: * * * Earliest use of psychoactive and medicinal plant 'Harmal' identified in Iron Age Arabia A new study uses metabolic profiling to uncover ancient knowledge systems behind therapeutic and psychoactive plant use in ancient Arabia To the point * Earliest Traces: A new study shows that Peganum harmala, also known as Syrian rue or harmal, was used as a burning substance in Arabia as early as 2,700 ye  more