Picture shows propolis in a beehive, undated. Propolis is a resin that bees create which contains a mixture of bee saliva, beeswax and substances from plants. (NewsX/Bee)
LOS BANOS, CA - SEPTEMBER 04: Samples of honey are displayed on a shelf at Gene Brandi Apiaries on September 4, 2014 in Los Banos, California. As California's severe drought pushes through its third year, honey bees are producing less honey due to a lack of wildflowers and fewer farm crops that honey bees extract nectar from to produce honey. (Photo by Justin Sullivan/Getty Images)