There is a useful question to ask about any everyday object: what did people do before it, and did they think they had a problem?
For most tools the answer…
There is a useful question to ask about any standardised object: what is actually setting the dimension?
For a great many things the answer is a material property or a…
There is a demonstration that has been used to teach chemistry for well over a century, and it works because a candle is far more complicated than it looks.
The…
There is a common assumption about early steam power that inverts the actual mechanism, and correcting it makes the whole development sequence comprehensible.
The assumption is that steam pushes. High-pressure…
Wet ground forms where water arrives faster than it leaves. What happens afterwards - what grows, what was cut, what sank and what is buried - is all legible from…
There is a picture most people have of a watermill that misses the part that mattered.
The picture is a wheel turning in a river, driven by the current —…