Moovly is another neat way of making fun animations, presentations and posters. Record what you want to say then use the ready made clip arts to illustrate. You can upload your own pictures too.
Use it to record explanations of theories or concepts in physics, to describe chemical processes or to tell some science history stories.
Here’s a brief and basic introduction to wave-particle duality, as a guide this took about an hour to produce including doing some research and learning how to use the Moovly tools.