MotoRepellent

In 2015, Thailand reported a 207 percent surge in dengue fever cases.

In response, engineers introduced MotoRepellent, a small, non-toxic device that fits onto a motorcycle’s exhaust.

As riders weave through Bangkok’s crowded slums, heat-activated oil releases a protective cloud, creating a three-meter mosquito-free zone.

One journey at a time, the city’s most common form of transport became an unlikely shield against disease.