I had 21 minutes this morning, to wait for the train. I fear boredom, so I filled up that time with an imaginary conversation with someone from a mediaeval village, explaining about how we live in the 21st century. I was only allowed to use words and references that someone from that time would understand, which is quite a challenge. I realized that I don't know how anything works, I may as well say planes, phones, computers, electricity is all magic, and I feel like I am living in a science fiction book... The 21 minutes went by very quickly. Job done.