Watch At the End of the Rainbow (1946) : Full Movie Online Free Discover the history of science and discovery the intricate forms of light. This informational short film emphasizes the importance of getting enough sunlight in our daily lives. The sun is essential because it comes in the form of Vitamin D which aids in strengthening our bodies. Great narration provides facts and figures about the bounty of the sun’s rays as diagrams are displayed, making At the End of the Rainbow a information packed film.