Eventually, the shouting and shunting back and forth achieves the desired effect and we are back on track.

BBC: Peru's famous yarn

Finally, if the models produce the desired effect, full-scale components are fabricated and tested on the track.

ECONOMIST: CAR DESIGN

For example, one day we might be able to design apps that allow people to probe their own cognitive abilities (processing speed, memory, decision-making, etc.) at any time during the day and track these abilities over the years, transmitting the results from their smartphones to a health care provider if desired.

CNN: How mobile tech can influence our brain