Why do some crucial scientific discoveries get left out of the canon?

Why do some crucial scientific discoveries get left out of the canon?
Could the next generation of batteries be powered by the atmosphere?
Reflecting impact, or just empty buzz?
What is the most effective way to compare researchers?
A perenial source of controversy.
A novel polymer delivery system for gene therapy slows cancer growth.
A better understanding of the mechanisms of neuronal nanoparticle transport.
Investigating the impact of the physical environment on immune cell activation.
Making origami with light.
Designing stronger, more durable materials for tooth fillings and bone repair