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Why might a weak acid like HF still be able to dissolve glass?
Old Friend
A person with whom one has had a friendship for a long time, often sharing many past experiences.
Long Documentary
A documentary film of extended duration that explores its subject in depth, typically running over an hour.
August 4
A date on the Gregorian calendar, notable for various historical events and individual commemorations depending on the year.
2012
A year recognized for significant global events, including the London Olympics and the speculated Mayan calendar end-of-world prediction.
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