There is a constraint that shapes plant biology more than almost anything else, and it is easy to overlook because it is so obvious.
Plants cannot move. Not slightly limited…
There is a fact almost everybody knows and almost nobody can explain, which makes it a useful place to start.
The Moon presents the same face to Earth continuously. The…
There is a common assumption that a hot place is hot and a cold place is cold, and that a location is one or the other.
Deserts break that assumption…
There is a widely held picture of how concrete works, and almost every part of it is inverted.
The picture is that wet concrete is a thick paste which dries…
Source: Wikipedia
There is a habit of treating zero as obvious, on the reasoning that nothing is a perfectly ordinary thing to have none of.
The difficulty is not the concept…
The shape of a letter is usually treated as a matter of convention, and to a large extent it is. But writing systems designed for a specific material carry that…