In some senses I am a creature of habit. I enjoy walking. I have my favourite walking spots, at the reserve, at the beach, around the streets close to my home, sometimes with my sister and my dog, sometimes with just my dog, and sometimes just on my own. Mostly I recognise the people I see on these walks. I don't know them, but I see them often enough to smile and exchange friendly greetings. Known strangers or unknown fr...