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The Flying Giraffe and Other Fossil Stories of Extinct Reptiles
November 4, 2017
Imagine a giraffe leaping into the air and flying off. That's what this giant pterosaur was like. Other interpretations about extinct reptiles are not so certain.
Finding Dinosaurs Is Not the Same as Explaining Them
October 19, 2016
What's turning up in dinosaur digs around the world? Bones, footprints and speculations.
Evaluating the Chicxulub Impact Dinosaur Extinction Hypothesis
February 10, 2013
Science Magazine claimed the Mexican crater named Chicxulub is the smoking gun of the dinosaurs' demise, and the media fell in line. Are there reasons to doubt the story?
Paradigm Shift: Impact Didn't Kill Dinosaurs
April 24, 2012
A new study casts doubt on whether asteroid impacts led to extinctions. It's based on re-interpreting geological evidence used to identify impacts. This finding, if sustained, would undermine the theory that an impact killed off the dinosaurs and a later impact led to the extinction of many large mammals. Even more significant, an overturn of the impact hypothesis would illustrate that scientists are capable of going off on wrong tangents for decades.
Where Do Gems and Precious Metals Come From?
September 7, 2011
Gold, diamonds, and other precious metals and gems... they are found close to the surface of the earth where humans can mine them and make jewelry. But they shouldn’t be there. Heavy elements should have sunk deep into the core of the Earth soon after it was formed. Wait till you hear some of the latest ideas about how precious metals and gems arrived near the surface. Maybe they shot up from the mantle. Maybe they came from outer space.