Scientific knowledge is in perpetual evolution it finds itself changed from one day to the next. – Jean Piaget
This means that no single logic is strong enough to support the total construction of human knowledge. – Jean Piaget

Scientific knowledge is in perpetual evolution it finds itself changed from one day to the next. – Jean Piaget
This means that no single logic is strong enough to support the total construction of human knowledge. – Jean Piaget
It is with children that we have the best chance of studying the development of logical knowledge, mathematical knowledge, physical knowledge, and so forth. – Jean Piaget
In other words, knowledge of the external world begins with an immediate utilisation of things, whereas knowledge of self is stopped by this purely practical and utilitarian contact. – Jean Piaget