yellow and green. The yellow light signalled drivers to slow down and prepare to stop. Potts’s invention, which became the world’s first three-lens automatic traffic light, was installed in ...

But the danger is that labeling foods as “green,” “yellow” or “red” won’t really help us become healthier eaters — just guiltier ones. The original traffic light diet was developed ...

the light and even the power source behind the standard red, yellow and green. The Sand Glass (right), from Thanva Tivawong, incorporates LED lights that appear to trickle from the top half of the ...

"Plus, the green, yellow and red system could be applied in many places," she says — like grocery stores, restaurants and even your own kitchen. In addition to using the traffic-light labels ...