Dan Williams meets scientists at Chicago's Northwestern University who have developed the FaceBit, or 'Fitbit for the face', which is a quarter-sized sensor which attaches to a face mask. The mask uses a small magnet and tracks a user's respiration rate, heart rate, how long they have been wearing the mask, and if the mask has begun to leak. Designed with the medical community in mind, it can be used by anyone to monitor their health, especially as many states and cities across the U.S. continue their mask mandates. 

A huge study of U.S. military personnel suggests almost all cases of multiple sclerosis are triggered by the common Epstein-Barr virus. Neil Cairns finds out more from Harvard Epidemiology professor Alberto Ascherio and MS sufferer Mick Slater. 

And a prototype magnetic levitation (maglev) train recently unveiled at Southwest Jiaotong University in Chengdu, Sichuan Province aims to set a new speed record for trains. The current record of 603 kilometers per hour is held by Japan's SC Maglev. China's answer to it is 620. Yang Zhao finds out more.