I am fascinated and in awe of how fast I heal.

Bite the inside of your cheek and within three days there is no evidence. The mouth is the fastest-repairing tissue you own, which is why nobody ever thinks about it.

Speed varies enormously by tissue. Skin is quick. Bone is slower and far better organised than anyone expects.

Nerves take their time and do not file progress reports.

The fast parts of you are working at that speed today regardless of what the slow parts are doing. Both are running at once, in the same body, which is a stranger arrangement than it usually gets credit for.