What are the 4 main ideas of critical rationalism and its application in the classroom?

For the purpose of this discussion, critical rationalism is defined as the way that we should approach knowledge. Critical rationalism believes that we don't have the ultimate answers and we should continue searching for them. It is modest. The search for the truth is the highest ideal. Critical rationalism does not include the need to justify your ideas. Existing rules and methods of scientific research are seen as inhibiting the search for new ideas. 
Critical Rationalism can be applied in the classroom by allowed every student the right to an opinion. His opinion can be criticised by other students. Through open discussion, students will learn to pursue knowledge. 

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