At MacBook's edge we come across a shiny bar (held in by 12 P2 Pentalobe screws) that also serves as an antenna.

That's the 6th kind of bit! Remember the days you could upgrade your RAM, double up on storage, and drop in an SSD with a Phillips driver and a free afternoon? iFixit remembers.

Behind the antenna bracket, we spy some fancy tech along the Pro's spine.

A spring mechanism rolls a flat cable up when the display is closed, and unravels when the display opens. This seems to make it a bit easier to close the lid.

Perhaps shaving a few ounces off the display assembly meant the new MacBook Pro couldn't rely on gravity to close nicely as much as previous models have.