However she said it was not easy to come up with a scientific explanation.
What is not easy to work out is exactly how many photons have arrived.
"It's not easy to turn the mirror back on yourself and be absolutely honest, " she says.
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The recovery was not easy, and, at times, as we toured the paintings, Landau seemed winded.
"It's not easy when your boyfriend says he doesn't remember you, " she said later.
It's not easy for women who aspire to be architects to find female role models.
Already Malaysia has discovered that opting out of the international monetary system is not easy.
Likewise, accepting Moore's Law (and its equivalents in storage and bandwidth) is not easy.
But he admits the life of a Marine is not easy on the family.
Cutting corners is not easy - but a necessary task when so many officers have left.
Changing the image of a century-old faded iconic retailer like JCPenney is not easy.
Thin, fit, about 5 foot 8 inches, he's not easy to pick out of a group.
Hence, the planning fallacy is a pervasive and persistent phenomenon that is not easy to tackle.
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The first should be obvious: in a place like Silicon Valley, socializing is not easy.
The social networking Web site has become littered with scams that are not easy to spot.
Obviously, we would have liked to have played better, but it is not easy out here.
The banks are far more circumspect now and getting a mortgage is not easy.
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It is not easy to read thoughts or moods from their faces and bodies.
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Your calling is not easy, because you must do the acting and the caring.
Not easy, you can see why the major release cycle might need to grow.
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But Mr Paolucci accepted that that was not easy to do when the room is packed.
It's not easy to interpret and define strange, ambiguous lyrics that could really be about anything.
"It's not soft, it's not vague, it's not easy... it's not easy to do, " Dakin says.
But this case reveals that preventing someone from traveling is not easy to do.
We have something seriously the matter with a system that is not easy to repair overnight.
It is possible for outside investors to buy Asian debt locally, but it is not easy.
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"It's not easy because we are bottom of the league and what's happened, " the Israeli said.
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"It's not easy to face a player such as Safin on hard-court, " said Gasquet.
"To score seven goals in a World Cup is not easy" said Portugal captain Ronaldo.
But gun ownership is strictly regulated and it is not easy to obtain a licence.
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