Winner: Cave of wonders by Heinrich Badenhorst Description: A Scanning Electron Microscope allows us to see this graphite crystal at a magnification of over 30000 times. It looks like a cave of stalactites and stalagmites, but these structures can be a thousand times thinner than a strand of human hair. When the graphite crystal is burned in oxygen, the impurities in the crystal prevent oxidation and create these wondrous structures.