One part of the mystery that remains hard to explain: Rawls' bike was found at home.
It is hard to explain the taxpayer advocate's silence on this issue when it was being debated.
It would be too hard to explain Pepsi's new marketing campaign in a 30-second TV spot, he adds.
Merrill publicly denied Spitzer's charges, but the embarrassing e-mails were hard to explain away in a sound bite.
Markets are supposed to be rational, but it's hard to explain this one.
Students said they found it hard to explain what it meant to them to lose their physical body of work.
"We had to work hard to explain that we are going to be OK, " says Mr. Sugg, the city manager.
At least in the short term, Kyoto imposes heavy costs on some countries that are hard to explain to voters.
The benefits of more efficient allocation of capital are huge, but they are really, really hard to explain simply and persuasively.
Such an abrupt change is hard to explain by demography alone, however.
"You will need to work hard to explain how your plan won't create a new generation of failing schools", he told Mr Gove.
Mr Chancellor is right to say that some economists have tried too hard to explain everything from the tulip mania onwards as rational behaviour.
Exporters of metals and chemicals should gain immediately, but the longer-term benefits of membership are hard to explain to a population that tends not to look far ahead.
"It's hard to explain how it is to be sitting with a bunch of people that you know they've been through the same thing you've been through, " George said.
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Many senior Kfor men say that the close former relations between the Americans and the Kosovar Albanians make it hard to explain now to Albanians that things have changed.
Underwriters, rating agencies, financial analysts and auditors all perform important roles in the financial system and serve us well, otherwise the service fees these institutions have generated for decades would be hard to explain.
Mr Fridson concedes that the difference between corporate-bond spreads and actual default rates is unusual and hard to explain: on the previous occasions when spreads have exceeded 800 points, the default rate was already 9.43% in 1990 and 5.44% in 2000.
It's hard to explain, but there's just something fundamentally different and exciting about looking at people's Instagram shots on a device that is so powerfully equipped for taking pictures of your own, with no other hardware or file transfers getting in the way.
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It's a hard game to explain, and even harder when it's tangled up with politics.
It is hard otherwise to explain the significant changes in alcohol-related deaths observed in British Columbia.
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