Every object, from a violin to a planet, has its own collection of resonances. Given a description of the object (such as its shape and material composition), it is fairly easy to calculate the ...
Tom Roberts asks whether an extension cord plugged into itself can be manipulated to form a knot (Letters, 12 September). We don’t need an equation or extra dimensions to solve his problem (and in ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results