Subject	baby boomer
Predicate	present
Object	challenge to future of social security
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.8453
Neighborhood Sigma	0.8453
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source baby boomers present a challenge to the future of social security 6 Google Autocomplete, Answers.com Questions