Yes many are free "Book 1" books of a series (which I never really like) but there are a few gems to be found and plenty of children's books to keep them entertained.See https://blog.the-ebook-reader.com/2020/03/28/420-free-kindle-ebooks-for-children-and-adults-plus-kindle-deals/.The Nikola Tesla one is at https://www.amazon.com/Nikola-Tesla-Imagination-Invented-Century-ebook/dp/B00CATSONE/ref=sr_1_158?dchild=1&qid=1585474231&s=digital-text&sr=1-158 with a 4/5 rating by 7,878 reviewers.#technology #readingIf you're looking for something to read while...