Which performer is associated with 'cohan'?

What is referred to by 'coffin carrier 10'? What is associated with: coffinite discovered in colorado in 1955 is an ore thats 60 this valuable radioactive metal? Based on the clue 'cognac is a type of this liquor that one story say...', what is the answer? What is referred to by 'cognitive deterioration sometimes senile'? Based on the clue 'cohen greenfield are the last names of the co fou...', what is the answer? Based on the clue 'coherant xenix are 2 of these part of the abbrevi...', what is the answer? What is referred to by 'coimbra aveiro'? Based on the clue 'coin this is the term for the collecting of coins', what is the answer?