Dr. Mike Evans is an associate professor of family medicine and public health at the Toronto General Hospital. The link above is to his YouTube channel which has many white board visual lecture series which aims educate the public with interesting stories about health. Check out his list of lectures to see whether it matches the curriculum of the grade you teach. Dr. Evan’s format might also be an interesting presentation format for students to emulate.
Two of my favourite lectures are on flatulence and concussions 101: