Although the learning process has been a hot topic of various sciences, including neuroscience, psychology, pedagogy and the learning theory, the truth is that humankind has yet to discover the full array of factors involved. For the time being, learning is defined as a process that implies constantly altering the existing skills, behaviors and information by synthesizing and acquiring new types of information.
Challenges are what make life interesting. Overcoming them is what makes life meaningful. – Joshua J. Marine
Quantum physics, Thermodynamics & Rocket science are three most difficult subjects of all kinds that can make both teachers and students go crazy or have to take extra effort to get the hang of them.