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"Getting a subduction zone started is like trying to push a train uphill -- it takes a huge effort," said Brandon Shuck, a geologist at Louisiana State University and lead author of the study.

“If you’re retired, you have to ask yourself, ‘What kind of risk am I taking with stocks’,” says money manager William Bernstein, author of The Four Pillars of Investing: Lessons for Building a Winning Portfolio.

"We were surprised to find that these specialized cells cannot do both jobs at once," says Douglas Brownfield, Ph.D., senior author of the study, which was published in Nature Communications.

“Basically, they are sacrificing their career-advancement opportunities,” said Mark Ma, associate professor of business administration at the University of Pittsburgh and one of the paper’s authors.

S Mark Young, a professor at the University of Southern California and author of The Mirror Effect: How Celebrity Narcissism is Seducing America, says Federline's book is unlikely to change people's minds about her.