One of the trickiest parts of writing science is finding your facts. Where do you go to find the latest and greatest information on a topic?
One good place to start is the Library of Congress. They have a wide variety of Reference Guides available to download. One of the most recent is The Science of Taste, compiled in January of this year. It includes references on the physiology of taste, flavor ingredients, the neurobiology and genetic variations.
Additional science reference guides include information on various scientists, gardening, obesity and much more. You can find the entire list at the Science Reference Guide page.
You can also find material in the form of video by checking out the listing of events sponsored by the Library of Congress. If anything these topics are even more varied than the reference guides. With just a quick glance, I spotted Mapping Water Use from Space with Martha Anderson, PhD.; Man Food Fire: The Evolution of Barbecue with Steven Raichlen, a winner of the several James Beard Awards; and My Winter in Greenland and Summer in Antarctica with Lora Koenig, PhD. about her study of the ice sheets.
Why not take advantage of the many wonderful resources the Library of Congress has to offer. You may find yourself adding primary sources to your bibliography.