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Size doesn't matter for crayfish's one-two crunch Biological deception may give crustaceans an advantage during a fight Web edition : Wednesday, March 14th, 2012 When it comes to male crayfish, not all claws are created equal.

Size doesn't matter for crayfish's one-two crunch Biological deception may give crustaceans an advantage during a fight Web edition : Wednesday, March 14th, 2012 When it comes to male crayfish, not all claws are created equal.

For decades, psychologists and other researchers assumed that the mother-child bond was the most important one in a kid's life. They focused on studying those relationships, and however a child turned out, mom often got the credit - or blame. Within the last several decades, though, scientists are increasingly realizing just how much dads matter.