Buckminsterfullerene or Buckyball C60 # 28
Buckminsterfullerene is a form (allotrope) of carbon. Sixty carbon atoms are arranged in a sphere (actually at the vertices of a truncated icosahedron). This image shows the carbon atoms at the size of their van der Waals radii as orange spheres. Fullerenes have rather exotic properties and these hollow balls of carbon atoms are likely to have many uses.