Sidewalk Scientist (Chinese: 學是學非) is a Hong Kong TV programme broadcast by TVB and presented by Kaki Leung, Ali Lee, Jacqueline Wong, Mayanne Mak, Sammi Cheung, Roxanne Tong, Crystal Fung, Tiffany Lau and Bowie Cheung. This programme explores the scientific knowledge in daily life through different experiments. Despite its English title, there are also segments to correct common misuse of English or Chinese, to clarify of legal misconceptions and to introduce local history. Sammy Leung was invited as guest host of the special episode of season 1 and has since become a returning guest host in following seasons. In season 2, a male guest host will join in as 'Captain'. In season 3, all of the episodes revolved around sports.