The Open Notebook is a “non-profit organization that provides tools and resources to help science, environmental, and health journalists at all experience levels sharpen their skills.” They welcome pitches for brief guides, story-behind-the-story interviews, and reported features. According to their guidelines, they pay $1,800 for interviews (1,500 to 2,000 words), and $2,400 for reported features (1,500 to 2,000 words). To learn more, refer to their submission guidelines.