Israel continues to hammer Gaza with airstrikes as it prepares for a ground invasion in the days ahead. Israel has ordered a total siege of the Gaza Strip after an unprecedented attack by Hamas in Israel. CBS News' Holly Williams reports.CBS News foreign correspondent Imtiaz Tyab looks at the Hamas militant group, which the U.S. considers a terrorist organization, and the motivation behind the brutal attack on Israeli civilians.AP African American Studies has drawn fire from some Republicans calling it "indoctrination" and a "propaganda leftist agenda." Students tell CBS News the course shouldn't be considered political or controversial. CBS News contributor Lisa Ling reports.Peloton instructor Alex Toussaint joins "CBS Mornings" to discuss his new inspirational memoir "Activate Your Greatness."Motivational speaker and entrepreneur Nicole Walters joins "CBS Mornings" to discuss her new book "Nothing is Missing: A Memoir of Living Boldly."See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.