Where is the Frontier for Frontrunners?

It is essential, for those who define themselves as 'frontrunners', to face the frontier of research. The researchers encounter the frontier, when they discover the problem. It is worthwhile to meditate on a methodology to choose a particular thorny path that leads us to frontier among infinite number of possible options. Examples of evolutions in the past and those of new challenges for discoveries are discussed here, in order to discover the problem. As a whole, the frontier is seen by frontrunners when they change their way of thinking. It this sense, the frontier for the frontrunners is in their mind. We wish prosperous futures of young frontrunners!