This is the 4879th most frequent Spanish word.
descubren
"Descubren" means "they discover" or "they uncover."
In this sentence, 'descubren' is conjugated in the present indicative tense and is used to indicate the action of discovering currently performed by 'los científicos' (the scientists).
Los científicos descubren nuevas especies en el Amazonas.
Scientists discover new species in the Amazon.
Here, 'descubren' again appears in the present indicative tense and demonstrates a habitual action performed by 'los estudiantes' (the students).
Cada día los estudiantes descubren algo nuevo en sus clases.
Every day the students discover something new in their classes.
In this example, 'descubren' is used to express the action of discovering, referring here to what 'los niños' (the children) do as they engage with books.