Use any library databases when searching for information.
Below are some which be useyou might want to browse when looking for topics for a public speaking class.
Provides access to synthesized medical information. Includes current, evidence-based, and graded clinical recommendations that are written, reviewed, and updated by world-renowned physicians. Includes topics such as Internal Medicine, Pediatrics, General Surgery, Dermatology, Palliative Care, and Psychiatry; graded treatment recommendations, drug monographs and drug interactions; medical calculators and patient education.
It's fine to use credible information from the free internet as a research source.
TIPS
Expertise: Generally, we are seeking information from a person or a group who is an expert on a topic.
Bias: Consider any biases the author or authors may have.
Consider the purpose: to educate, entertain, persuade, insight violence, humor or parody, other?
Is the information appropriately current for your need?