A new study examines nickel and urea in early microbial habitats, showing how ancient cyanobacteria adapted to their chemical ...
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This Rare Bicentennial Quarter Has Nearly $20K Value — Plus 7 More Worth Thousands
The Mint produced the bicentennial coins between 1975 and 1976 as a special edition. Here's a look at several that have sold for more than $1,000.
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