Put cabbage in a blender with 2 cups of water, and blend at the highest setting. Strain cabbage pieces out, and keep the juice. Now your cabbage indicator is ready to mix with any safe liquids you want to test to see if it is acid or base. Test vinegar and baking soda, and notice the color changes. Read more about acids, bases, and neutrals.
Every person has unique footprints and toe prints.
However, there are not many criminals who walk around barefoot, leaving footprint clues at the crime scene. So footprints are not used very often in solving crimes. There is another use for footprints as a unique means of identification. Look at the footprints below and see if you can guess what they are . Lip Prints Lip prints are often left at crime scenes on, for example, glasses and cups.