crossword puzzle
ACROSS
 1 Contracting organ 4 Chemist's container 9 Natural sunscreen 10 Substance used to convert one substance into another 11 Chest protection 12 Vena ____ 13 Type of brain wave 15 Blood pigment 16 Early scientist 18 Unnatural 20 Ph.D. exam, often 23 Being 32 degrees, say 24 ____ Test (carcinogen detector) 25 Blood vessel 27 Unexpressed, recessive trait possessor 28 Modified base present in some tRNAs 29 Possible cause of pallor and weakness 30 Long terminal ____ 
 1 Brain function 2 Like many powders and puzzles 3 Chemical bond 4 Sac of friction-reducing fluid 5 Change that improves survival odds 6 Heart of the matter? 7 Inspired medicine 8 Simple hydrocarbon 14 Element obtained by the bombardment of molybdenum 17 Local deficiency of blood supply 18 Glucose polymer 19 It's free of charge 21 Uracil's partner 22 Give a disease to 24 The way from a man's heart? 26...

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