Many of these late nineteenth century houses would not have been built had it not been for a major tragedy.

VOA: special.2009.06.01

Now he would have to deal with the problems that presidents before him had not been able to solve.

VOA: special.2009.05.07

The epidemic might have been even worse had it not been for the father of the actress Glenn Close.

VOA: special.2009.02.23

If they had, they would have been tested to see if they needed treatment to prevent an infection like H.I.V.or hepatitis.

VOA: special.2010.02.10

But some historians suggest that the inclusion of opponents may not have been as smart an idea as Lincoln had hoped.

VOA: special.2009.02.09

And.He created the kind of world he would have wanted to live in if he had been a man."

VOA: special.2010.01.10

President Garfield had been assassinated by a man who believed he should have gotten a government job because of his politics.

VOA: special.2010.04.29

La Brea scientists had a chance to investigate an area that otherwise would have been impossible to study.

VOA: special.2010.04.07

She says many people wonder how the country's history would have been different if one gunshot on one evening had not happened.

VOA: special.2009.07.24

So she drove him home. If my brother had driven home from the bar that night, his number would have been up.

VOA: special.2009.07.19

Kevlar might not have been invented had Stephanie Kwolek been able to seek a career in medicine.

VOA: special.2010.02.09

Some degrees have even been withdrawn after a school later found that a student had plagiarized.

VOA: special.2009.04.16

He told how northern cities would have fallen had Lee not been stopped at Gettysburg.

VOA: special.2009.11.12

They said it might have been prevented had he received the dental care he needed.

VOA: special.2009.03.11