According to the selection from The Future of the Mind, how does scientific evidence support the idea that "practice makes perfect"

devin will have to drain the rain out from his garage.

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.