Respuesta :

1: The early years (starting, so it'll be first)

2: A love for learning (he had to learn before he could invent, so I am putting this one second)

3: The inventions that matter (he had to learn before he could invent, so I am putting this one third)

4: Gone but not forgotten (ending, so it'll be last)

Have a nice day!

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather