The yellow dot should be lined up and directly next to the valve stem, which is the wheel’s heaviest point. The red dots identify where the tire is flattest — the lowest point on a tire.

THIS mind-boggling illusion used to demonstrate what people with colourblindness can see has blown the minds of social media users. All you have to do is stare at the middle of the green, yellow, ...

Red dots indicate shootings, yellow dots are stabbings, blue are other methods. Click on a dot for more details of the incident. Links to the Bay Area News Group articles about the crimes are below.