This paper presents the application of special relativity to different thought experiments. Some issues will be noted and a modification of special relativity will be presented. That modification can be tested and one interpretation of the preliminary result supports the modification. After presenting the history of special relativity, the non-simultaneity of special relativity is questioned in our macro world. In addition, some issues between light-clocks and the application of Lorentz transformation are presented. All this indicates that there is something not right with special relativity. A new proposal is presented based on an adaptation of special relativity; this new proposal solves the anomalies and could be a solution to the twin paradox. It has a prediction: a difference with special relativity which has been tested with a new experiment and the preliminary results support the new proposal. Previously, a lack of special relativistic effects has been observed in the universe [Davis et al., 2004]; that second observation is also explained with the new proposal.