Researchers analysed thousands of laboratory-made plasmids and discovered that nearly half of them had defects, raising questions of experimental reproducibility.
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Before the second world war, most Native Americans lived on reservations. Biological children would be enrolled as tribal members, but so would adopted children and spouses, if you were legally married.
But as people moved away to urban areas, tribes started to get more rigorous about documentation. That's when they also started to move towards only enrolling biological relatives. They were trying to figure out how to maintain the tribal population when everybody was living so far away.
How did they determine which people were legitimate biological relatives?
They started to focus on what's known as "blood quantum" as a way of counting ancestors who were enrolled as Native American. In most US tribes, you have a specific blood quantum needed for enrolment – often one-quarter. That means you have to be able to show with paper documentation that you have one out of four grandparents who is full blood. Or you might have two grandparents who are half blood –...