Why is it easier with two than it was with one?

I'm left wondering this question daily. Last year, with just one lovely daughter, I was house-bound. I didn't want to go out. It was too difficult to make story hour, I was nervous about grocery shopping alone with her. I didn't go anywhere! Now, you can't stop me. Well, the occasional cold or need of nap really does slow me down, but otherwise, I'm on the move! I wouldn't visit my parents on their vacation because I was afraid of travelling with the 10 month old, ha! No more. I'm not sure if it is just because I am more confident as a mother, or if I'm just in desperate need of an escape from the madness that is my house. I feel trapped by the babies, and I won't let them hold me down! I need companionship from adults and a conversation that will stimulate. I'm not neglectful, I don't drag them kicking and screaming. Rather, they are generally gems. Cooperative, smiley, and happy. Maybe the big one would have been last summer, too. I was just too much of a wimp to try!