The final piece of the battery puzzle came from the lab of Akira Yoshino in Japan, who found that lithium ions could also slip in and out of petroleum coke, a carbon-rich material derived from oil refining.
If you think about the best technical speeches you've ever heard, they were probably great because the speaker was able to distill the idea into its core simple message.
Then you have the element of refinement of folk themes, which you find in all classical music, and this is what the jazz musicians do with the songs of Cole Porter and George Gershwin.
Even if you've read the whole passage already for the other questions, be sure to take a quick pass through the noted passage or paragraph to make sure that you're pulling out the correct idea.
So vanillin is a component that's derived from oil that we pump out of the ground. It's the same feedstock that we use to make petrol that we use in our cars.