For secondary level there are two exams which certify the completion of first or second level, and assess knowledge on mathematics, social and natural sciences and philosophy (the number and content of subjects varies per level).

UNESCO: Country Profile: Chile

Natural philosophy, based largely on the works of Greek and Roman thinkers like Aristotle, Galen, Ptolemy, Archimedes and many others, therefore became a major part of the syllabuses of Medieval universities.

FORBES: Connect

She also had a view of science that was unashamedly broad, taking in arts, literature and natural philosophy much in the mould of Erasmus Darwin at the end of the 18th century, whose tomes on botany and zoology were written in Wordsworthian verse.

ECONOMIST: Obituary

Which natural philosophy is a better description of the real world?

FORBES: Connect

The Young Eisner Scholars is the outgrowth of one man's natural curiosity, not a predetermined pedagogical philosophy.

WSJ: The Unlikely Reformer | Innovator of the Year 2012 Education