And knowing the rate at which neutral mutations accumulate in most animal species, the 50% figure suggests that the first asexual rotifer lived about 80m years ago twice as far back as the oldest known fossil bdelloid, a 40m-year-old specimen preserved in amber.
Imagine going to a supermarket where none of the prices was posted or checking into a hotel without knowing the room rate.
Knowing your desired rate of return is simple enough, but whether you can reasonably achieve that rate of return or tolerate the necessary risk is another story.
One nurse consultant I spoke to told me that being asked to vote on whether or not to accept the deal felt a bit like trying to decide whether or not to take out a bank loan without knowing the interest rate.
Until this summer, the London Interbank Rate Offering Rate (LIBOR) was an omnipresent seemingly esoteric instrument that few non-financial people actually paid attention to other than knowing that their interest rate was somehow linked to it.
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Policymakers have no way of knowing what an economy's maximum growth rate or minimum unemployment rate are.
Once again, we have no way of knowing how far in advance you requested the rate, or if it was even the convention hotel.
Knowing when your employer intends to integrate the corporate bond rate into your plan, and the impact this will have on your lump-sum value, is crucial for your retirement planning.
Meanwhile, foreign banks operating in Cyprus will probably head for the hills, knowing that an economy already in recession will probably now contract at a rate of knots - causing penury to many.
Knowing the sheer number of requests that they get, it makes sense that their rejection rate is so high.
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