Marla Spivak, of the "Benefits of Propolis to Honey Bees: Newest Data", provided her talk free of charge but invites donations to the work of her laboratory at the University of Minnesota.
More details of the support that your donation could provide, and a link to a donations page, may be found by following this link.
Please give generously!
The Central Association of Bee-Keepers
Bringing Science to the Bee-Keeper
Bringing Science to the Bee-Keeper