english lesson for the day

http://www.dailywritingtips.com/poring-over-pore-and-pour/

Some confusion appears to exist regarding the use of pour and pore.

Charlie complains that he has to pour through stacks of badly-written letters to the editor every day.

In this context the word should be pore. The usual idiom is “to pore over.” Apparently the preposition “through” has entered into use, as in the above quotation, and as in this headline in the New York Times:

Teachers Pore Through Stacks Of Possibilities

The verb pore, with the meaning “examine closely,” may derive from two Old English words, a verb, spyrian, meaning “to investigate, examine,” and a noun, spor, meaning “a trace, vestige.”