Explain alternative facts.
"alternative facts" are fictions used to replace facts because you don't like what the facts are and would prefer it to be those fictions, either because you directly prefer those fictions, or you can use those fictions to try to get something else that you want.
"alternative science" can follow the same kind of emotional response, where you discard real science and replace it with something else. On the minor end this would be simply starting with a conclusion you want to be true and trying to find excuses for why it could be true; and on the more extreme end, just blatantly lying about what the results of certain experiments are.
What wrong with conventinal science is that their are a lot of people reporting things that science says can't be true, but if true could be very beneficial and freeing.
See, this is an example.
People don't like reality, so they try providing a fiction which they prefer.
It would be great if we could have a machine magically produce energy from nothing such that everyone could have unlimited free power, but it simply can't happen.
Likewise, it would be great if diseases didn't exist, but they clearly do and are clearly quite damaging (at least some are).
If instead of trying to claim diseases aren't real, or claiming magic cures; people accepted that they were real and attempted to find real cures the world would be better off. Even if those people just didn't try to falsely claim the disease isn't real or try to sell their snake oil, the world would be better off as people would be more inclined to either seek treatment or protect others.
Likewise, it would be great if Earth was flat, such that there was only a single time zone. Gone would be the issues of trying to have a chat or meeting with someone in a different timezone, or even further having to change your sleep schedule to try to match a different timezone. It would also make it much easy to travel without issues caused by timezones.
But something being good doesn't mean it is true. The facts simply do not support it.
Something being beneficial and freeing if true doesn't make it true.
Science doesn't care if something discovered is good or bad, it cares if it is true.
First thing - can i ever see earths curvature from the ground and how.
There are several options. Here are some examples.
1 - Watch the sun set, being obscured by Earth - Technically this could work for a FE, if the sun set for everyone, rather than always being above some point on Earth.
2 - Watch a large object set over the horizon.
3 - Go and find a tall mountain and measure the angle of dip to the horizon from various altitudes up the mountain.
4 - Find a series of objects in a straight line at the same elevation and observe how they appear to curve downwards.
5 - Requires travel and is less direct, observe the position of celestial objects and how they vary over time and location.