Rare coins from the late 1800s can be worth a lot, due to several factors including the silver standard that was in place in ...

It's election day in Tucson and voters are set to weigh in on a half-cent sales tax increase that would raise some $800 million over 10 years to fund public safety and community investment.

"The goal of this project was to explore the fundamental low-mass limit of the star and brown dwarf formation process." ...

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