The SEC's anti-naked short-selling restrictions also continue in place, including a requirement that short sales be closed out within the settlement period, with penalties on further short-selling activity if the close-out isn't followed.

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Dr Nichols suggests that this diversity is a result of a relatively long period of human settlement there.

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The period of human settlement over the past 10, 000 years is known as the Holocene, during which time temperatures and hence sea levels (the two having a close correspondence) have been remarkable stable.

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That regulation, called Reg SHO, went into effect in January 2005 and was supposed to impose strict close-out requirements on stocks that showed consistent and frequent settlement failures over a specific period of time.

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Often if a settlement is to occur, it is in this time period.

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Following a public comment period, the FTC has accepted as final a settlement with Facebook resolving charges that Facebook deceived consumers by telling them they could keep their information on Facebook private, and then repeatedly allowing it to be shared and made public.

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