i wish you offer voice recording books, i bought two for my grandson , because i live in another state, i can read him a story before bed. and with the teacher to watch the film particularly interesting form of articles and books. i proudly support them and i encourage you to do it too. you can use whatever you want. what advice would like to you give to early career scientists? thus you can put any of them out of the cluster and back into their original states. 