13. A few years ago， in one of the most fascinating and disturbing experiments in behavioural psychology， Stanley Milgram of Yale University tested 40 subjects from all walks of life for their willingness to obey instructions given by a “leader” in a situation in which the subjects might feel a personal distaste for the actions they were called upon to perform. (5A0102)
14. How can we possily account for this vast discrepancy between what calm， rational， knowledgeable people predict in the comfort of their study and what pressured， flustered， but cooperative “teachers” actually do in the laboratory of real life? (5A0102)
15. A modern hard-core sociobiologist might even go so far as to claim that this aggressive instinct evolved as an advantageous trait， having been of survival value to our ancestors in their struggle against the hardships of life on the plains and in the caves， ultimately finding its way into our genetic make-up as a remnant of our ancient animal ways. (5A0102)
16. Breeding seasons in animals such as birds have evolved to occupy the part of the year in which offspring have the greatest chances of survival. (5A0403)
17. This is the process by which plants use energy from the sun to convert carbon from soil or water into organic material for growth.(5A0403)
18. Recently， however， it has been experiencing something of a renaissance， with renewed demand for original Bakelite objects in the collectors’ marketplace， and museums， societies and dedicated individuals once again appreciating the style and originality of this innovative material. (5A0201)
19. The fact that children’s ideas about science form part of a larger framework of ideas means that it is easier to change them. (4A0101)
20. These misconceptions do not remain isolated but become incorporated into a multifaceted， but organised， conceptual framework， making it and the component ideas， some of which are erroneous， more robust but also accessible to modification. (4A0101)
21. Never before has the planet‘s linguistic diversity shrunk at such a pace. (4A0201)