With an extraordinary new technology called CRISPR, we can now edit DNA—including human DNA. But how far should we go? Gene-editing promises to eliminate certain genetic disorders like sickle cell disease. But the applications quickly raise ethical questions. Is it wrong to engineer soldiers to feel no pain, or to resurrect an extinct species?
Can bringing predators—and fear—back into an ecosystem help restore its natural balance?
Follow eagles from the nest to the skies to see what makes these predators so remarkable.
Goddess, demon, house pet? What does science say about the human relationship with cats?
