Assertion: researcher | /r/CapableOf | experiment with smartphone app
Facets:
value: in recent years
type: TEMPORAL
Source sentences:
text: In recent years some researchers and companies have experimented with new ways to motivate exercisers through their ears, such as a smartphone app that guides the listener's escape from zombies in a postapocalyptic world and a device that selects songs based on a runner's heart rate.