There is still much debate about why Spinoza was excommunicated.
There's a lot of debate about why college costs have risen so much.
For some time now, there has been a debate about why the labor-force participation rate has fallen so far.
Though few experts question Mr. Hussein's determination to obtain nuclear and biological weapons, there is a debate about why.
(Of course, there remains a running debate about why Mr. Paulson didn't seek to have the government bail out Lehman Brothers; he says he didn't have the powers).
The findings, being reported in the current issue of The Lancet, are likely to stir debate about why the numbers are so different.
Until I posted several videos of wedding disruptions to my Facebook page last month, there seemed to be barely any debate about why they were happening.
Maybe, I thought, I could start a debate about why so few black and minority ethnic people are nominated and why some won't accept.
They prompted debate about why a Hollywood studio was more successful than the country's own studios at creating a successful movie based on Chinese themes.
The debate about why the S. Vietnamese & the Americans failed to pinpoint the size & number of attacks will go on indefinitely.
"There is debate about why long-term unemployment remains so high," Federal Reserve chair Janet Yellen said in a speech in April.
