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the long walk of the polar bear, including one cub, not much bigger than a poodle. just the kind of sighting to given even the skeptics hope. >> they are well inls lated. they have a great supply of warm milk and a beautiful mom. so, life's all good so far. >> reporter: in two years, these cubs will be on their own, and the cycle, in a part of canada that has the feel of another planet, will repeat itself as the polar bear's long journey marches on. i'm neal karlinsky for "nightline," near churchill, manitoba. >> certainly nice to watch from a warm place. a different kind of mother's day tribute. >>> well, mother's day is, of course, sunday, which got us to thinking about the state of moth motherhood around here. and what we found out made us want to take a look at mother's day by the numbers. ♪ [ male announcer ] an everyday moment can turn romantic anytime. and when it does, men with erectile dysfunction