"We need to make some disgruntled Barcelona residents see that visitors to the city are not their enemies"

Estela Mariné Roig, PhD in Tourism, course instructor, and winner of the 2018 Medalla del Turisme de Catalunya (Catalonia Tourism Medal)

"The sustainability of free software is at risk; its breakdown would be disastrous because we're surrounded by things that depend upon it"

Jordi Cabot, ICREA research professor and leader of the SOM research group at the IN3

"A year from now, Airbnb will have standardized its operations and brought them more into line with local regulations"

Mayo Fuster, researcher and co-organizer of the Sharing Cities Summit at the Smart City Expo World Congres

"Even though technology will change how medicine is practised, we need to teach professionals to maintain the human touch when interacting with patients"

Joan Comella, CEO of the Vall d'Hebron Research Institute

"The hijab crystallizes the struggle between feminism and religion"

Míriam Hatibi, spokesperson for the Ibn Battuta Foundation

"I doubt there will be a repeat of an attack like the one on Las Ramblas in Barcelona, but we mustn't let our guard down"

Andrés Ortiz, journalist specialized in international politics

"We can't let large corporations be the only ones who can talk and argue about big data"

Anita Say Chan, a science and technology historian and anthropologist with a PhD from the MIT

"We need to reflect on whether we travel to get to know a place or to tell others about it"

Celia López, coauthor and editor of the blog Quaderns de Bitàcola

"Digital technology makes access to education easier and reduces the cost without affecting the quality"

Vijay Kumar, Associate Dean of Digital Learning at the Massachusetts Institute of Technology (MIT)

"Simeone and Guardiola are great coaches, but their conflict management could be better"

Xavier Pastor, Master's Degree in Conflict Management and Resolution professor