Sailing+Stones+of+Death+Valley+4

https://docs.google.com/a/hamptontalbots.org/presentation/d/1ohNnpXuHAvBrn-KWlpqzXIZIsB_qY2XfV2InC6Y8K_A/edit#slide=id.g18073e0c2_31

Sailing Stones of Death Valley by James McDaid and Jason Kcehowski