Neutrino Experiment

Neutrinos are tiny particles probably best known for having limited interactions with matter, meaning they can pass through solid objects.

The Argument
It is possible to detect neutrinos, and this has been done many times. Scientists run experiments to analyse them, and these experiments implicitly use the curvature of the Earth by, for example, shooting a beam of neutrinos through the Earth and measuring it coming out in a predicted other location. This would not be possible if the Earth was flat.

The Response
This is not a test of the Earth's shape; first and foremost that must be acknowledged. Things not meant to test for the Earth's shape are always going to overlook things. In this case what is being overlooked is that neutrinos are naturally occurring. The exposure of the atmosphere to radiation, such as from the Sun, alone generates neutrinos.

Now we must look at how the experiments are run. There is a station in one location that fires neutrinos into the Earth, and there is a station elsewhere that receives neutrinos. How does this station know the source of the neutrinos it receives?

The short answer is that it doesn't. Generally speaking the reason neutrinos are fired through the Earth along sufficient distances that curvature would be expected is to try and limit the amount of naturally occurring neutrinos, sometimes by artificial means, ensuring that most would be absorbed if they travel along the correct path to the receiving end. The blockage expected under RET simply would not be there on a flat Earth, thus it would be expected that naturally occurring neutrinos would be received.