If and when it happens, we might not know until it’s too late.
What appears to be a life-affirming triumph is really a cautionary tale about drones and wildlife.
Pets left behind when people fled the disaster in 1986 seem to have seeded a unique population.
The threat to humans is low. But the status quo is still pretty troubling.
New evidence is prompting some researchers to rethink ethics in the lab.
Medical-research institutions draw on a thriving black market in stolen and fraudulently obtained pets