Perhaps one can only speculate about the motivations behind this decision. However, some sources speculate a possible though uncertain connection between the two. However, some sources speculate that he may have been murdered. People can gossip all they want; they can speculate all they want. Researchers speculate that this may contribute to premature unblinding. Archaeologists can only speculate as to why this was done to some of the skulls. Certain observers, however, speculate that they may be from Poland or Belarus. Some historians speculate that the conversion was forced. Some speculate that higher taxes could help reduce soda consumption. Before the 1990s, historians could only speculate about its existence and content. Obama replied that he did not want to "speculate" on the matter. For years, people would speculate about her reasons for leaving the public eye. A dog might as well speculate on the mind of Newton. Rumors speculate that he fell off a bridge. On this we can only speculate.