the strange video trail of gisele esteban the day before michele disappeared. >> it shows just a walking around with a lab coat on and pretending to be an instructor. >> weird. >> yeah. >> was she up to? when dateline continues. up to whenamwork... long walks.... that's how you du more, with dupixent, which helps prevent asthma attacks. dupixent is not for sudden breathing problems. it's an add-on-treatment for specific types of moderate-to-severe asthma that can improve lung function for better breathing in as little as two weeks. and can reduce, or even eliminate, oral steroids. and here's something important. dupixent can cause serious allergic reactions, including anaphylaxis. get help right away if you have rash, shortness of breath, chest pain,