Don't you hate it when you put a Band-Aid on and you don't know when the cut is healed? Then, you peel the Band-Aid off before the cut is closed and blood starts gushing out again while you are scrambling for another Band-Aid.
Now, you won't have that problem any longer. In Australia, researchers have created a smart bandage. The bandage will change color from red to green to blue so that you will know when the wound is fully healed.