Huh? Why can't we? My mom's been doing this for I believe the moment I was born? What do you expect the definition of multi-tasking? Doing one other task with two hands at the same time?

Even doing just one job, you are multi-tasking. How about me typing, I'm not just typing these words by my mind, I use it with my hand. So just the basic thought of that, I'm multi-tasking.

I can't even comprehend how can one can't multi-task. Even when you walk, you're not just walking, you're also balancing that's also a multi-tasking I believe.