File this one under "Coolest thing we've seen all day": a cube of magnetic putty swallowing a smaller cube of metal whole ... in the putty are strongly attracted to the magnet and very slowly ...

Of all the materials in the world, only metals can be magnetic. But some metals are magnetic and some are not. The metals that are magnetic (attracted to magnets) are also the metals that can be made ...

Iron is magnetic, so any metal with iron in it will be attracted to a magnet. Steel contains iron, so a steel paperclip will be attracted to a magnet too. Most other metals, for example aluminium ...