nancy grace covered it. >> brittanee drexel's mother is with us, dawn drexel. ms.ice telling you? >> they have some leads that they are going on, but they need to follow through with them. >> dawn and the police pieced together brittanee's last days before she went missing. >> what had you put together? what had brittanee been doing during those days in myrtle beach before she went missing? >> well, we know she got down there thursday. >> on friday night, she was walking on the boulevard by herself, which is not normally like brittanee. >> the fantasies of coming down to myrtle beach with the older crowd and friends, all of that wasn't panning out the way she thought it would. >> she went down with two couples. it was kind of like she was a fifth wheel. when she got down there, she felt isolated, and that's why she reached out to other people that she knew from rochester to go and hang out with them. >> we knew that she'd gone to meet some acquaintances at the blue water resort. >> brittanee reached out to peter brozowitz, who she knew from rochester and was also d

i school of public health, drexel university in philadelphia. i'm a demographic by trending, and previously i saw as the executive director of the african population health research center in my b. and i also found on the un high level advisory board for economic and social affairs. i guess it's really hard for me to grapple with what 1000000000 people looks like. what that feels like. well, i feel different on november, the 15th, and i do right now, rachel. no, you won't. in simple terms. yeah. this has been a while coming and yeah, you won't feel much on the 15th of november. jennifer, when we talk about a number like 8000000000. if you're studying population, then you knew it was coming. i remember at school we were usually worried about how many more billions of people can, can survive on the earth. and he, we, our 8000000. what does that mean for most of us? how should we think about that number? well, you know, i also remember studying this in school and actually i think that's how i ended up making career career out of studying population