jennifer sheba, i am a scholar at the woodrow wilson center and author of the new book, 8000000000 in counting how sex death and migration shape our world. thanks for being with us and alex, welcome back to the stream. get to see you again. remind our audience who you are and what you day a thank you. i mean, thank you for having me back and profile x as it does. i prefer some global health . i don't. 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 comi