Explorers, ruled by dopamine, tend to be novelty seeking, risk - taking and spontaneous and tend to work well with other explorers. (onlinepersonalswatch.com)
I Wonder Why Columbus Crossed the Ocean and other Questions About Explorers by Rosie Greenwood (Kingfisher, 2005, ISBN: 0 -753-45860-8) does a great job explaining the journey of Christopher Columbus and includes other explorers as well. (essentiallearningproducts.com)
NASA will reallocate those funds for other Explorer missions. (spacepolicyonline.com)