In 1929 Professor Ernest Glen Wever and his research assistant Charles William Bray conducted a series of experiments using a live cat. They first sedated the cat and opened the skull to access the auditory nerve in order to attach it to a telephone wire that was connected to a telephone receiver. One scientist spoke to the cats ears while the other one listened through the receiver which was 50 feet was away in a soundproof room. They did various experiments using this poor cat which led them to win the first Howard Crosby Warren Medal of Society by the Society of Experimental Psychologists in 1936.
As we all know A/Ls is a very tough exam and you will not be able to finish it successfully by just studying.It needs practice,timing and all.So the best way to do it is do exercises and improve knowledge,i did A/Ls in physical science stream and in sinhala medium,so based on my experience i will recommend anyone to use following books.There may be books better than following list,but books below were used by me. Chemistry almost every book by hemachandra basnayaka Akabanika rasayanaya by Aruna Bandara (there are two books for inorganic chemistry,these books will help you in for the doubts you will have in doing mcqs) Akabanika rasayana pilibanda gunathmaka ha pramanathmaka wishleshanaya by Ranga gunarathna(this also will help you in mcqs) Organic chemistry by jayathilaka(this book is very good and it will help you to understand concepts in organic chemistry better) Physics Prof D.D.N balo dayas' books yanthra vidyawa by lakshaman dissanayaka(questionsin this book are
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