When I was a biochemistry graduate student ages ago, a wise post-doctoral fellow once told me that there's no failed experiments in science if you can consume the result of your experiments (he was a Russian guy, and experimented on alcohol - and yes, he drank his experimental results afterwards).
In the same vein, here's an experiment by Imperial College of London's Chemical Kitchen to determine the best way to roast a potato in the oven.
If watching that video made you too hungry to continue, I'm happy to report that by cutting the potatoes at 30 degree angle, you can increase the surface area for extra crispiness. Better yet, you can add even more surface area by using a crinkle cutter.
Come to think of it, repeatability is a bedrock of doing science so I'm sure you'd want to repeat the roast potato experiment over and over and over again. Y'know, for science.
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