Here's a curated collection of youtube channels that try sciency things, where I'm reasonably certain they aren't faking results.

NileRed

Sample video: making a superconductor from scratch

https://www.youtube.com/watch?v=RS7gyZJg5nc&t=93s

ExplosionsAndFire:

Sample video: concentrating hydrogen peroxide

https://www.youtube.com/watch?v=LhEYaovWxl4

Primitive Technology:

Sample video: making cast iron using nothing but gathered natural materials (seriously)

https://www.youtube.com/watch?v=dhW4XFGQB4o&t=606s

Игорь Негода

Sample video: making and flying an extremely elegant turbine engine in the garage

https://www.youtube.com/watch?v=dYFYZ-g7fzA

Bobby McBoost

Sample video: making and exploding an extremely half-assed turbine engine in a field.

https://www.youtube.com/watch?v=L2jHC_91ge8&t=52s

Brick experiment channel

Sample video: measuring the thrust to weight ratio of a bunch of combinations of lego motors, gearings, and propellors. In the next video he is able to achieve flight by overvolting lego motors

https://www.youtube.com/watch?v=TTui3shLRPk

Styropyro

Sample video: huge homemade ruby laser

https://www.youtube.com/watch?v=DwYuHqCwXFI

Robert Cowan

Sample video: improving the drive system of his 250 lb battlebot

https://www.youtube.com/watch?v=Wcl7WYLccIs

How Not to Highline

Sample video: Testing if climbing equipment that has been left in a cave for years is still safe by breaking it

https://www.youtube.com/watch?v=AE69L7wwm64