 a sensor that can detect 50 types of cancer cells in your blood. Think about it for a moment. How do you know when you have cancer? Well, when you see a tumor, for example. But by that time, it's too late sometimes. By the time a tumor forms, it's pretty advanced. However, wouldn't it be great if you could simply take a simple blood test, a simple blood test, to detect cancers? Well, we can now detect cancers in that way.