On the first day on science, we did a topic: fingerprints and all about clues, mystery's..., then we found out what type of finger prints like, whorl, arch, loop, tented arch... thirdly we did, hand prints in sand, then poured plaster in the hand prints tip: before pouring the plaster into the prints spray it with hair spray then the sand will stay more structured.
[I don't own this image]


