This Week in Science

In Science this week, a group from the Ludwig Maximilian University of Munich report a chemical method to synthesize the nucleotide bases adenine and guanine at high quantities, providing evidence to support the theory that RNA was the original self-replicating molecule that gave rise to life on Earth. The RNA-world hypothesis posits that life arose from a set of small molecules assembled to produce nucleosides and later informational polymers capable of replicating themselves.

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The London School of Economics' Daniele Fanelli argues at the Proceedings of the National Academy of Sciences that the reproducibility crisis in science isn't as dire as some say.

A team of researchers in Portugal has examined the genomic basis for racing pigeons' athleticism and navigational skills, finding it's likely polygenic.

Wired reports that diagnostic firms continue to seek, post-Theranos, the ability to diagnose diseases from small amounts of blood.

In Science this week: analysis of DNA from ancient North Africans, and more.