At a guess, assuming you mean challenges involving getting, preparing and cooking food, under the ocean; in the desert; in the Arctic and Antarctic.
Brazil's greatest challenges
What are the greatest challenges facing a health center
leadership transition
his challenges are that he took Persephone.
When he wrote his plays i belive that was one of the most greatest challenge in his life.
trying to learn how to write.
Cloud Security is a problem
Curing AIDS and Genital Warts
Fun food challenges to do at home with friends
keeping his army together
dehydration
my greatest strength is my strong desire to meet and overcome the work challenges. My greatest weakness is that must be continuously driven by new tasks.