Directional Selection | Definition, Graph & Examples

Directional Test (Directional Hypothesis)

The story of how the K-Pg hypothesis went from a radical fringe idea to maybe the most well-known event in all of natural history begins with a strange dusting of rare metal found buried in the earth. This is the first in a long trail of clues that, now, is leading us not just into deep time, but also into deep space. In the span of just four decades, we’ve gone from not knowing there was a space rock at all to knowing exactly where that planet-killer came from. Learn more in our latest video! #