What are the best possible fan theories to defeat Thanos in Avengers 4?

There are several fan theories

Theory 1

Iron Man , Ant man and Hulk (probably) travel to alternate realities/timelines to collect infinity stones .

Theory 2

Captain Marvel's Cascade of Superpowers come in handy .

these are just two of the theories .

The key solution must be with tony otherwise doctor strange would have not sacrificed the time stone for Tony's life .

What do racists think of non-racists?

They think they're faking virtue. They believe everybody thinks like they do, but some people pretend not to, in order to look good. So they believe non-racists are liars, or possibly incredibly naive, and only non-racist because of inexperience or ignorance.But racists know

How does the Marvel Cinematic Universe story deal with the absence of the X-Men and the Fantastic Four?

The MCU (Marvel Cinematic Universe) is aided by the fact that the way Marvel Comics writes their various titles each super group's adventures seem to exist in their own universe. While there is occasional overlap, things that The Avengers do rarely

Was the Black Death just bubonic plague?

Some (particularly Scott & Duncan, 2001) argue that the Black Death was caused by a virus.  While the recent genetic studies (Haensch et al., 2010) showing the  presence of Yersinia Pestis in plague pits has been claimed to prove the  Yersinia Pestis theory,