For the friends and family: We are quite safe. Yesterday morning, a cliff fell onto a bunch of multi-story homes in Cairo. The English-language news has described the area as variations of "shanty towns," "squatter towns," and "informal communities." Basically, Cairo is dense and there is a vast differences between the rich and the poor, and of the latter, there are around 2 million people who live in homes which have been built on its outskirts. They don't officially own the land (it is not officially Cairo), there is no running water or utilities, no formal governing structure. This happened on a weekend morning during Ramadan, when entire families would have been home together, enjoying the holiday.