>> gregg: a lot more needs to be studied about this. >> we need to understand more and it will be a new avenue of research. >> gregg: i finished my cup of coffee, sitting here and i'll get one for the train ride home. >> five cups of coffee a day. >> gregg: i've had 7 or 8! maybe an espresso. doctor, good to see you, as always, thank you so much. >> thanks. >> gregg: we survived the end of the world. >> heather: yes, we did, by the way! >> gregg: i put off paying bills just in case! that will do it for us, fox news sunday with chris wallace is coming up next. >> heather: and we hope you have a great week and, we'll see you later. >> gregg: bye-bye. [ male announcer ] everywhere your pet goes