Genetic Engineering Possibilities

More than 10,000 single-gene diseases could in theory be corrected at the source, among them sickle cell, cystic fibrosis, and Huntington's. With CRISPR, a precise edit can target the exact mutation behind each one, turning conditions we now only manage into conditions we might prevent before birth.

Recap: Evolution's Next Chapter

Humans are still evolving, but culture now changes selection pressures faster than genes can follow. Cities, medicine, food systems, pathogens, and climate all shape the future.

Gene editing adds a new possibility, but complex traits like cognition, muscle, and disease risk are highly polygenic. The hard problems are technical, ethical, and social at once.