Basically, nobody knows anything. Every smart-ass knowledge goes up in smoke within the framework of the big events. The earth is a disc? Nobody survives more than 30km/h? Flying is impossible?
To believe that one really knows something is a historical mistake that repeats itself all the time. The world is not finished because you are the newest generation. After us come billions of people who will laugh themselves to pieces, that we thought the earth was a sphere, time travel would kill you, beaming would be impossible.
Nobody really knows what is really going on outside our heads. No one will ever be able to comprehend the real reality. All truths are speculations that the world lives by until a new truth comes.
Trust in what you don’t know and do it anyway.