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Gerald Meehl says a better understanding of solar activity and its influence on weather may help researchers predict long-term weather conditions.

VOA: special.2009.09.29

Speaking by Skype, Laura Middleton noted two long-lasting effects that physical activity can have on teenagers.

VOA: special.2010.07.07

Pfizer ( PFE - news - people ): Long-term options activity on the pharmaceutical giant indicates some strategists expect shares in Pfizer to remain range-bound through June 2011 expiration.

FORBES: Bulls Swing For The Fences With Priceline, Silver Wheaton

If you go too far, however -- either with extreme short-term activity or long-term overtraining -- the immune system weakens.

CNN: Signs you're too sick to work out

Archives are the by-products of human activity retained for their long-term historical value.

UNESCO: Preserving our written heritage