Materials:

• soft leather scraps
• block of wood
• stapler
• marker
• sunscreen
• baby oil
• water

1. Take 4 scraps of leather and staple them to a block of wood.
2. Use a marker to label the strips "Suncreen", "Baby Oil", "Water", and "Natural".
3. Then rub a thick layer of sunscreen across the top of the sunscreen strip, baby oil over the baby oil strip, and water on the water strip. Don't put anything on the natural strip.
4. On a very hot summer day, take the strips of leather outside and let them bake in the sun. The next hot, sunny day, reapply the sunscreen, baby oil, and water and repeat the process.
5. Keep doing this every hot, sunny day.
6. At the end of the summer, closely examine how the strips of leather held up. Now imagine that the leather is your own skin!
   
   Source: 1001 Ways to Explore Science and Nature