You can look at science at AO:
http://amblesideonline.org/07bks.shtml
http://amblesideonline.org/08bks.shtml
Classics like Bambi and Rascal are good for nature. You might find them on audio at the library or Audible. Some AO books are at LibriVox for free downloads.
https://wiki.librivox.org/index.php?title=Recordings_of_Books_on_the_Ambleside_List_2
My Side of the Mountain
Elements by Theodore Gray (also Molecules)
Chipmunks on the Doorstep by Tunis
A Sand County Almanac by Leopold
various biographies of scientists