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I'd imagine it would not be hard to breed/engineer a coffee plant that produces more paraxanthine than caffeine. The plants take 5 years to mature so getting a crop to market would take a while though.
The Rubber Used to Keep Undersea Tunnels Sealed Is Decaying from the Inside Out Faster Than Engineers Thought

Engineers thought a simple strip of rubber would keep the ocean out of undersea tunnels for a hundred years. They were wrong.

The Daily Galaxy - Great Discoveries Channel
Also, phase change hot water 'batteries' - https://sunamp.com/blog/new-video-on-how-phase-change-materi...
New video on how phase change materials heat hot water in homes - Sunamp Global

Sunamp’s Thermino heat battery features in a new video from the popular technology YouTube channel 'Undecided with Matt Ferrell'.

Sunamp Global
Is there a 'teaching the test' element to this? Does more exposure to education increase your ability to take a standardized test?