Did research, did maths on 144,000 on dates, on everything.
My favourite is the Romans 13:1 How can JWs explain how for many decades just about every Christian religion understood the correct interpretation of scripture, except JWs. Christians kept telling the JWs they were the only ones who had misinterpreted. In 1962 watchtower admitted JWs wrong, other Christians correct, & that JWs were correct between 1880 and 1929 until Rutherfords new light. It took until 1996 to alter policy on alternative service through lack of two thirds majority of Gov Body vote. Meanwhil JWs stayed in prison unnecessarily around the world.
The elder I study with had to admit when I raised this that JWs have NEVER got any information from God. This is just one of so many absolute proofs. This can be found from researching ONLY JW material. If Dennis wants details of what WT publications for research, just pm me.