London, Day Two. -- Again my step-counter showed 25,000 steps at the end of the day, and given my step-size, this equals 20 km. This time we walked all the way to the Tower of London and Tower Bridge. I had never been inside. We certainly learnt a lot, and had fun along the way. On the long way back my daughter insisted that we discuss philosophical issues. I don't recall how we got to the question whether knowledge is factive. She provided so much resistance that I started sweating. Like father, like daughter?