The test is simple: pigment colour looks the same from every angle, and structural colour changes as you move. Once you know that, a great deal of the natural world…
Ice cubes float. This is so ordinary that it takes a moment to see anything strange in it.
Consider what floating means. An object floats when it is less dense…
Almost nobody looks at a dark night sky and thinks it requires explanation. It is dark because the sun has set, which seems sufficient.
It is not sufficient, and noticing…
Nearly every effect below comes from one of three things: a curved surface that guides sound, a shape that focuses it, or a surface that refuses to reflect it at…
Transparency is so familiar that it stops registering as strange. You look through a window and see the street, and it does not seem to require an explanation.
But consider…
Source: Wikipedia
There is a limit to how loud a sound can be, and it is lower than most people assume.
Sound travels as alternating regions of higher and lower air…