] Secret Worlds: The Universe Within
]
] View the Milky Way at 10 million light years from the
] Earth. Then move through space towards the Earth in
] successive orders of magnitude until you reach a tall oak
] tree just outside the buildings of the National High
] Magnetic Field Laboratory in Tallahassee, Florida. After
] that, begin to move from the actual size of a leaf into a
] microscopic world that reveals leaf cell walls, the cell
] nucleus, chromatin, DNA and finally, into the subatomic
] universe of electrons and protons.

Molecular Expressions: Science, Optics and You - Secret Worlds: The Universe Within - Interactive Java Tutorial