Gemstones like precious opal are beautiful to look at and deceivingly complex. As you look at such gems from different angles, you'll see a variety of tints glisten, causing you to question what color ...
Part I: Evolutionary History -- Chapter 1: Two hundred years of studies on plains vizcachas -- Chapter 2: Pan-Chinchillidae, a once diverse clade -- Chapter 3: The fossil record of Lagostomus: a 10 ...
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