The “best” would be some kind of DC to DC converter, but I’m not sure there’s anything plug and play atm because there’s a wide range of specs laptops want. If your laptop happens to change with USB c PD or whatever the spec is that’d be the most efficient that I’m aware of. No sense in going dc->ac->dc if it can be helped.

Ah maybe. I was I guess blessed with not having that ability.

Well that’s cool. Can you write in scan-able barcode?

When you say teeth do you mean like with your tongue on the roof of your mouth/behind front teeth? Or is there something new I can learn?