Before the revolution
We conclude that it can be useful to teach something that is actually wrong.
Four elements, four humors
Degrees of difficulty
Impossible, inevitable and in between
Some actions in science fiction are much more difficult than others.
An audio culture
A video culture?
Upgrading
A small change
Starting from here
Multiple-choice History
Making it simple
Our tutor ponders the trade-off between accuracy and simplicity in teaching.
Windowsill Tai Chi
Another way of looking
Our photographer explores one of the changes brought about by the virus.
Back to sea
A different world
Our navigator points out how the world of the sailor has become entirely disconnected from that of the rest of us.