If a person doesn't have a sense of achievement in their real life, it's easy to lose themselves in a virtual world where they can get a false sense of accomplishment.
Jill, Here's a Lockpick. It might be handy if you; the master of unlocking, take it with you.
Momentum, a function of mass and velocity, is conserved between portals. In layman's terms, speedy thing goes in, speedy thing comes out.