It's pouring outside.

Save for the three brief ¼-mile descents, before Bakewell, Monsal Dale and Miller's Dale, the line is climbing uninterruptedly at round about 1 in 100 for 9 miles from Rowsley almost to Miller's Dale, ….

We interact with them in ways that we don’t with inanimate appliances. (...) We do this because robots have what experts call “social valence,” meaning we ascribe to them human qualities, like personality.

The Kolmogorov quotient of any topological space is a Kolmogorov space.