There is enormous knowledge that can be gained from internet, we just have to be careful about the source. I checked up my info from
Few amazing facts – There are 25,000 different bee species around the world and only four of these species are honeybees.
And there is an apocalyptic quote attributed to Albert Einstein (although there is no proof he actually said it): “If the bee disappeared off the surface of the globe then man would only have four years left to live.” – from www.theguardian.com
Here is an interesting youtube video for kindergarten kids.