Three weeks ago, I had a bike crash I can’t remember.  I’m finally able to walk and cough without too much pain, but other than some scrapes and bruises, I’m okay and grateful.  I’m mostly grateful that I don’t seem to have lasting brain damage (my concussion left me with no memory of the crash, ambulance trip, and most of the hospital).  For the first week I could barely walk.  Rolling over in bed was an ordeal.  Thinking was slow.  But the crash left me…