This is the 5940th most frequent Swedish word.
intressant
Interesting.
Here, 'intressant' modifies the noun 'film', serving as an adjective describing its quality.
Den filmen var verkligen intressant.
That movie was really interesting.
In this case, 'intressanta' is the definite form of the adjective 'intressant', due to the definite noun 'upptäckten'.
Har du hört om den intressanta upptäckten?
Have you heard about the interesting discovery?
Here, 'intressant' describes the abstract idea of 'seeing what happens next', functioning as an adjective linked to an infinitive clause.