Revisiting the Terawatt Challenge by Kurtz, Sarah R., Leilaeioun, Ashling Mehdi, King, Richard R., Peters, Ian Marius, Heben, Michael J., Metzger, Wyatt K., Haegel, Nancy M.

Theoretical Challenges in Galaxy Formation by Naab, Thorsten, Ostriker, Jeremiah P.

Spinal muscular atrophy — insights and challenges in the treatment era by Mercuri, Eugenio, Pera, Maria Carmela, Scoto, Mariacristina, Finkel, Richard, Muntoni, Francesco

CoQA: A Conversational Question Answering Challenge by Reddy, Siva, Chen, Danqi, Manning, Christopher D.

How firms realign to tackle the grand challenge of climate change: An innovation ecosystems perspective by Falcke, Lukas, Zobel, Ann‐Kristin, Comello, Stephen D.

The role of phytopathogenicity in bark beetle-fungus symbioses : a challenge to the classic paradigm by Six, Diana L, Wingfield, Michael J

The challenge of unprecedented floods and droughts in risk management by Li, Hong-Yi, British Geological Survey [Wallingford], British Geological Survey (BGS), Center for Environmental and Geographic Information Services (CEGIS), Tovar, Carolina, Imperial College London, Technical University of Crete [Chania] (TUC), Massachusetts Institute of Technology (MIT), Nguyen, Hong Quan, Erfurt, Mathilde, Kreibich, Heidi, Centre of Natural Hazards and Disaster Science [Uppsala], Wickham, Elliot, Albert-Ludwigs-Universität Freiburg = University of Freiburg, KWR Watercycle Research Institute, Research Institute for Geo-hydrological Protection [Perugia] (IRPI), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Institute for Water Education (IHE Delft), Sazonov, Alexey, Bos-Burgering, Liduin, Abeshu, Guta Wakbulcho, Grillakis, Manolis, Sharma, Sanjib, Otto-von-Guericke-Universität Magdeburg = Otto-von-Guericke University [Magdeburg] (OVGU), François, Didier, Wang, Yueling, Barendrecht, Marlies, H, Mård, Johanna, Tsinghua University [Beijing] (THU), University of Houston, van Vliet, Michelle, T. H, Tang, Qiuhong, Operations Department, Barcelona Cicle de l’Aigua, Foundation for Research and Technology - Hellas (FORTH), Faculty of Chemical Engineering [Vietnam National University, HCM], Ho Chi Minh City University of Technology [Vietnam National University, HCM] (HCMUT), Vietnam National University, Ho Chi Minh City / Đại học Quốc gia TP. Hồ Chí Minh (VNU-HCM)-Vietnam National University, Ho Chi Minh City / Đại học Quốc gia TP. Hồ Chí Minh (VNU-HCM), Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China, Ho Chi Minh City University of Science [Vietnam National University, HCM] (HCMUS), Universitat de Barcelona (UB), Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI), Helmholtz-Gemeinschaft = Helmholtz Association, Universidad de la frontera [Tecumo, Chile] = University of La Frontera [Tecumo, Chile] = Université de La Frontera [Tecumo, Chili] (UFRO), OE OBSERVATORI DE L'EBRE RAMON LLULL UNIVERSITY ROQUETES ESP, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Agency for the Assessment and Application of Technology, University of Saskatchewan [Saskatoon, Canada] (U of S), Koutroulis, Aristeidis, Esposito, Giuseppe, Lomonosov Moscow State University = Université d'État Lomonossov de Moscou [Moscou] (MSU), Stahl, Kerstin, Center for Climate and Resilience Research [Conception] ((CR)2), Universidad de Concepción = University of Concepción [Chile] (UdeC), Centre de Recherche en Géographie (LOTERR), Université de Lorraine (UL), Steinhausen, Max, Blöschl, Günter, Aghakouchak, Amir, Trelleborg municipality, Hanoi University of Science and Technology (HUST), Tian, Fuqiang, de Ruiter, Marleen, C, University of Potsdam = Universität Potsdam, Aznar, Blanca, Delus, Claire, Mendiondo, Eduardo Mario, Ward, Philip, J, Pontificia Bolivariana University, Faculty of Civil Engineering [Bucaramanga], Bradley, Chris, University of Nebraska–Lincoln, University of Nebraska System, Nagavciuc, Viorica, Riegel, Jannik, Frolova, Natalia, Frappart, Frédéric, European Project: 01003276, Daliakopoulos, Ioannis, Freer, Jim, Couasnon, Anaïs, University Stefan cel Mare of Suceava (USU), Institute of Environmental Science and Geography [Potsdam], University of Potsdam = Universität Potsdam, Razavi, Saman, Vietnam National University, Ho Chi Minh City / Đại học Quốc gia TP. Hồ Chí Minh (VNU-HCM), Wendt, Doris, E, Khoi, Dao Nguyen, Hellenic Mediterranean University, Università degli Studi di Roma "La Sapienza" = Sapienza University [Rome] (UNIROMA), Institute of Meteorology and Water Management - National Research Institute (IMGW - PIB), California State University [Long Beach] (CSULB), German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ), Carlson, Hayley, Mohor, Guilherme Samprogna, Skane University Hospital [Lund], Ngo-Duc, Thanh, Sairam, Nivedita, Kireeva, Maria, Nanjing University (NJU), Kharlamov, Maxim, van Huijgevoort, Marjolein, H. J, Vrije Universiteit Amsterdam [Amsterdam] (VU), Thao Nguyen Huynh, Thi, University of California (UC), Wagener, Thorsten, Buytaert, Wouter, University of Birmingham [Birmingham], University of Bristol [Bristol], Istanbul Technical University (ITÜ), Budiyono, Yus, Balkhi, Laila

TRACHEOBRONCHOMALACIA: THE COUGH CHALLENGE by KHALIFEH, YARA, BOSHARA, PETER, ZEID, HIBA, DEBIANE, LABIB

MBenes: progress, challenges and future by Zhang, Bikun, Zhou, Jian, Sun, Zhimei

Carbapenemase-producing Pseudomonas aeruginosa -an emerging challenge by Tenover, Fred C., Nicolau, David P., Gill, Christian M.

When Challenges Hinder: An Investigation of When and How Challenge Stressors Impact Employee Outcomes by Rosen, Christopher C., Dimotakis, Nikolaos, Cole, Michael S., Taylor, Shannon G., Simon, Lauren S., Smith, Troy A., Reina, Christopher S.

COVID-19: a new challenge for human beings by Yang, Penghui, Wang, Xiliang

Teachers for rural schools – a challenge for South Africa by Du Plessis, Pierre, Mestry, Raj

Management’s Science–Practice Gap: A Grand Challenge for All Stakeholders by Banks, George C., Pollack, Jeffrey M., Bochantin, Jaime E., Kirkman, Bradley L., Whelpley, Christopher E., O’Boyle, Ernest H.

GAD antibodies in neurological disorders — insights and challenges by Graus, Francesc, Saiz, Albert, Dalmau, Josep

Comment on: Pasco ST Et Al. “Challenge‐Specific Modulation of Responses to Adjuvant‐Induced Innate Immune Memory” by Vijayasimha, M., Srikanth, M.

Grand Challenges and Inductive Methods: Rigor without Rigor Mortis by Eisenhardt, Kathleen M., Graebner, Melissa E., Sonenshein, Scott

The Priority and Challenge of High-Power Performance of Low-Platinum Proton-Exchange Membrane Fuel Cells by Kongkanand, Anusorn, Mathias, Mark F.

SimCol3D — 3D reconstruction during colonoscopy challenge by Rau, Anita, Bano, Sophia, Jin, Yueming, Azagra, Pablo, Morlana, Javier, Kader, Rawen, Sanderson, Edward, Matuszewski, Bogdan J., Lee, Jae Young, Lee, Dong-Jae, Posner, Erez, Frank, Netanel, Elangovan, Varshini, Raviteja, Sista, Li, Zhengwen, Liu, Jiquan, Lalithkumar, Seenivasan, Islam, Mobarakol, Ren, Hongliang, Lovat, Laurence B., Montiel, José M.M., Stoyanov, Danail

The promise and challenge of therapeutic genome editing by Doudna, Jennifer A.