Guinness World Records says it has recognized Israel's Science and Technology Ministry for holding the "largest chemistry lesson."
Guinness spokeswoman Anne-Lise Rouse confirmed the feat Thursday.
On Sept. 22, the ministry organized a class in 13 locations that drew 4,207 participants.
They carried out a reenactment of an experiment performed in space by the late Israeli astronaut Ilan Ramon, who died in the 2003 Columbia space shuttle disaster.
The record for a single venue - a separate category - was set earlier this year in Belgium, with 562 participants.
Ministry director Menachem Greenblum says the Guinness acknowledgment "brings additional world honor to Israel as a scientific powerhouse."
Israeli scientist Dan Shechtman won this year's Nobel Prize in chemistry.