Theranica Nerivio: Best Inventions 2019

Worn on the upper arm, Nerivio electrically stimulates the body’s own neural pathway for tamping down pain signals. When they feel a migraine aura starting, patients put on the device, which is calibrated to a wavelength that addresses their pain. For now, the $99 device requires a doctor’s prescription and is only available at designated ­pharmacies. —Alice Park