What superpower would you like to have? The stock answers are flight or invisibility, but I'd have to go with X-ray vision. When fixing a machine or implement, having the ability to see what's going on inside would be priceless.
This here is the next best thing to having X-ray vision: The fellow behind Project Farm, a YouTube channel that tests shop tools and fixes, wanted to see which penetrating oil works the best. To do it, he rusted up a bunch of bolts, tapped pieces of acrylic to insert them into, then purchased six products-- Brake Fluid, Seafoam Deep Creep, Fluid Film, BG In-Force, WD-40 Rust Specialist, CRC Knock'er Loose--and applied them such that we can see the oil penetration in action: