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Massive early-type stars vary; low-mass late-type brown dwarfs vary, too. Iwill make a short, but illustrative, summary of my previous studies on stellarand sub-stellar photometric variability (including the discovery of the mostvariable brown dwarf in the whole sky), and explain how amateurs can helpprofessional astronomers with our investigations.

(Sub-)stellar variability: from 20 M$_{\odot}$ to 13 M$_{\rm Jup}$