The Awards also reserve space for two central challenges of the present, those of climate change and development cooperation. (salk.edu)
Two central challenges for educators are identifying the correct levels of academic difficulty for each student and finding methods for ascertaining whether texts are appropriately challenging. (educationworld.com)
(released in 2008, 1 - 2 players locally or online)-- Features new species and Piñata Central challenges, plus desert and arctic regions to visit and catch native Piñatas. (thegamersparadise.com)