Cumulative preferred stock buffers the risk of a skipped dividend payment by allowing past due dividends to accrue.
FORBES: Why Warren Buffett Prefers Preferred Stock
The risk seems to be cumulative: The more people in a family who have a condition, the more likely it is that a new member will also suffer.
CNN: Will my baby inherit bipolar disorder?
But it isn't clear whether the risk is the same from cumulative exposure in smaller doses, such as multiple CT scans each delivering 10 mSvs.
WSJ: New Tracking of a Patient's Radiation Exposure
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