Pupils research infectious diseases then design and build a model of a hand washing device for a school in Kenya. Stop the spread is a STEM challenge which enables pupils to research the problem then use their STEM and communication skills to design a hand washing device and education materials for a primary school in Kenya. The design challenge: Working as a team pupils design, build and test a model of a hand washing device that can capture and dispense water for hand washing. The research and communication challenge: Pupils find innovative ways to communicate the problems cause by the spread of disease and the importance of hand washing to primary school pupils in Kenya. The challenge is perfect for STEM clubs, integrating into your D&T and science lessons or running as an off-timetable day. It and is accredited for their CREST Discovery Award and can also be used to enter the Youth Grand Challenges competition.