30 second books are absolutely amazing for all ages. Wonderfully illustrated, short explanations. Buy them, gift them to people, learn.

I learned so much but wow I really need a physical copy of this to properly digest! Very interesting and in depth despite the 30 seconds.

A beautiful book - but I was sent a version for my phone which was essentially a PDF, which meant it was incredibly hard to read without zooming in for every paragraph and moving back and forth. Happy to properly review with a print or kindle copy, but it wasn't really possible on my phone.