An answer is more likely true, when independent thinkers over centuries have reached the same conclusion. The answer to a complex question is more likely true, when the answer provides a unified principle of the whole, which incorporates known facts, reason and common sense; and leaves no facts outside the principle of the whole.
https://www.youtube.com/watch?v=WbG6mzYUnyU&feature=youtu.be&fbclid=IwAR07cSRiUzBpr1LyW6_XXDtifWuQI9z0N3RTdP37Hv9HXv6oyu1qvRAe1gg