Potential Paths: Path 1: The teacher can make use of Sizzle which serves as an educational assistant for solving math and science problems. With its capability to guide students through each step of solving a problem, it could help cover fundamental scientific concepts in an interactive way. Path 2: The teacher might leverage MagicSchool AI which offers lesson planning, content generation, and assessment creation features, together with the ability to adapt reading materials to various proficiency levels within a classroom. The lesson planning feature in particular could help the teacher in creating interactive and engaging scientific lessons for a high school audience.

Final Narrative: In response to your query on finding a low-pressure, interactive lesson covering fundamental scientific concepts for high school students, I recommend the use of MagicSchool AI.

Here's how you could make use of it:

1. Lesson Planning: Exploit the extensive library of MagicSchool AI that offers lesson plans tailor-made for different subjects and learning objectives. The lesson plans can provide a comprehensive structure for your interactive scientific lesson.
2. Content Generation: Utilize the swift creation of original, educational content which adheres to standard curriculum norms. These could supplement the lesson plans already present and be used to elaborate on fundamental scientific concepts.
3. Assessment Creation: Generate customized assessments that align with your curriculum and learning objectives. This would enable the evaluation of your students' understanding and facilitate their grasp of these concepts.
4. Text Leveling: Adapt the reading materials to differing proficiency levels within your classroom, striving to ensure no student is left behind in understanding the depth of these scientific concepts.

Currently MagicSchool AI is free for teachers. Therefore, it not only caters to your requirement effectively, but it also provides an excellent value proposition. As an additional advantage, user testimonials indicate that its straightforward interface further enhances the overall experience. Please note that MagicSchool AI plans to switch to a subscription model in the future.