Anybody know what this is?
(And don't say 'some plant' if you want to retain my friendship.) It seeded itself a few weeks ago and has been growing like a triffid.
The reason I mention it is that it's the only plant I've ever seen that has worked out what a right angle is. Take a closer look, from above:
Those leaves are at exact ninety degree angles to each other, in opposing pairs all the way down the stem, north-south, east-west, etcetera. This is extraordinary. Plants aren't supposed to be able to do geometry, are they?
Pythagoras discovered the right angle, on which, dare I say, much of human achievement has since been built. (If you don't believe me, read 'Why does E=mc squared?' by Brian Cox and Jeff Forshaw, which lucidly traces Einstein's theory of relativity directly from Pythagoras's famous theorem. (You'll have to work your brain a bit though.))
So, it appears that this humble weed has, all by itself, grown one of the greatest achievements of the human intellect. It deserves at least a name for that. Anybody recognise it?