This lovely book was the first of my Christmas presents from the Mr. Isn't it sweet? It's a bit sciency and very colourful! Illustrations are by Helen Borten and it was published in 1962.
The second lovely book he bought me was I Know a Lot of Things by Ann Rand, which I've been after for ages. The illustrations are by Paul Rand and this is a first edition from 1956. It's a bit scruffy and has "Discard" stamped on a few pages, but that adds to the charm I think.