Brunch Reads – 7/5/26

One Sheep, Two Sheep: On July 5, 1996,

a lamb was born at the Roslin Institute near Edinburgh, Scotland, as part of an effort to determine whether an adult cell could be used to create an entire animal. Scientists hoped the work could eventually help produce livestock with desirable traits and support medical research by making genetically identical animals. To create the lamb, they removed the nucleus from an unfertilized egg and replaced it with genetic material taken from a mammary gland cell belonging to an adult Finn Dorset sheep. The reconstructed embryo was then implanted into a surrogate mother.

The birth itself appeared ordinary. The lamb, later named Dolly, was delivered normally and initially looked like any other healthy sheep. What made her extraordinary was discovered through genetic testing: she carried the nuclear DNA of the adult sheep that had supplied the mammary cell, making her the first mammal cloned from a mature body cell. The result proved that an adult cell still contained all the genetic instructions needed to produce a complete organism, even after the cell had specialized for a particular function.

Dolly’s creation opened new possibilities in biology, agriculture, and medicine, including cloning valuable animals, preserving endangered species, and creating genetically matched animals for research. It also presented difficulties around animal welfare, genetic diversity, and the possibility of human cloning. Although Dolly was the only successful birth from hundreds of reconstructed embryos, the experiment changed scientists’ understanding of how flexible adult cells could be and helped pave the way for later advances in stem-cell research and regenerative medicine.

Economic Trends

Mexico in U.S. Supply Chains: Lessons from 2018-19 Tariffs (Federal Reserve)
US tariffs on China helped redirect production toward Mexico, which has overtaken China as America’s largest source of imports, but most of Mexico’s gains came from Mexican firms and other foreign manufacturers rather than from goods simply routed through the country. Chinese-linked production in Mexico accounted for an estimated 14% of the increase, while direct transshipment was negligible, suggesting tariffs are changing where goods are made more than encouraging simple tariff evasion. [Link]