The world of atoms--The energy of atoms--The discovery of
X-rays--The discovery of radium--The discovery of the
electron--The electron theory--The structure of the
atom--The new view of matter--Other new views--The
nature of electricity--Electric current--The
dynamo--Magnetism--Ether and waves--Light--What the
blue "sky" means--Light without heat--Forms of
energy--What heat is--Substitutes for coal--Dissipation
of energy--What a uniform temperature would
mean--Matter, ether, and Einstein--The tides--Origin of
the moon--The earth slowing down--The day becoming
longer.