On the 31st of August 2019, David Wu cycled into Malaysia, across the Thai border. It was the final leg of a journey that began two years prior, as he set off around the world on a bicycle to raise money and awareness for the National Cancer Society of Malaysia. David traversed 4 continents and 26 countries; in the process cycling to the Seven Wonders of the Modern World. We speak to David Wu about the challenges of his journey and how his effort has made a difference in the lives of children with cancer.