Hospitals and health officials in Gaza say another round of Israeli strikes has killed at least 50 Palestinians. Israel has intensified operations as Palestinians mark 77 years since the Nakba this week. Nakba, which means "catastrophe" in Arabic, refers to the loss of land by the Palestinians in the 1948 war that cleared the path for the creation of Israel. Many in Gaza fear there may be a repeat, given what is happening in the strip.