Wondersurf 
Keen nose – Part 2
Super-Nose to help
To understand this better you can try a little experiment:
Take a little cup of water und put your finger in it. Then press the finger on a sheet of paper. Put the finger again in the water and press it a centimeter away from the first mark. You can do this ten or twenty times. Then wait a little bit. Which fingerprint will dry at first? The one you did at the beginning!