A Genetic Curse, a Scared Mom, and the Quest to ‘Fix’ Embryos
Danielle Messer carried a mitochondrial mutation that left her son severely disabled. Before even daring another pregnancy, she tracked down an “egg specialist.”
Crispr Can Speed Up Nature—and Change How We Grow Food
It took thousands of years for humans to breed a pea-sized fruit into a beautiful beefsteak tomato. Now, with gene editing, scientists can change everything.