Desert, anyone? If you're worried that running 30km through a desert is just a bit of selfish nonsense, here is your chance to make it meaningful. Rotary International District 3450 - Hong Kong, Macau and Mongolia (don't ask) - are organising four races from 10km to 30km to raise funds for PolioPlus, a global project to eradicate polio by 2005. Participants will be competing on the Silk Road, past key landmarks such as West Thousand-Buddha Caves and Mingsha Shan sand dunes. The event is on September 29, and the enrolment deadline is August 2. Contact programme chairman Rainbow Li on 9022 0600 or by e-mail: rain65li@netvigator . com.