Source: Wikipedia
There is a class of invention that is invisible because it is too small to notice, and fastenings are the clearest example on any person's body right now.
The…
The single fact that organises the subject is that magnetism is produced by moving electric charge, and every electron is both moving and carrying an intrinsic property that behaves like…
The idea that fixes everything else is that suction does not pull. Removing air from a tube lets the surrounding atmospheric pressure push liquid up into it, and the atmosphere…
The single idea that makes all of this make sense is that cold is not a thing being added but heat being taken away and put somewhere else. Everything below…
The useful distinction is between materials that store energy in their shape and materials that store it in their disorder. A spring does the first and rubber does the second,…
The whole subject is fluid control. Too little and nothing appears; too much and it blots; and the difference between the two is a matter of fractions of a drop.…