How do you discover a rocket?

The National Geographic put out a book: 100 Scientific Discoveries That Changed The World.  They included the rocket but left out the steam engine.  They included a tomato crossed with a kiwi fruit but left out the hypodermic needle.  They included the internal combustion engine but left out the printing press.  Curious, don’t you think?  Their 100 discoveries were printed in a book.  They sell magazines.  They sell printed magazines.  The written word has changed the world, right?  Okay fine, the written, then printed word.

Maybe they plan on coming out with another book: 100 Not So Interesting, Kinda Mundane, Mechanical Discoveries That Changed The World.

They can put the internal combustion engine in that one too.  Maybe they could consider including the steam engine as well.  And jelly beans.