NMR Spectroscopy
What is shielding in NMR?

When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
Blocking parts of a molecule from Rf radiation
Putting metal around an Rf source
Using a curved piece of metal to block an opponents attack

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NMR Spectroscopy
Coupling causes the peaks in 1H NMR spectra to be split into

two peaks
multiple peaks equal to the number of surrounding carbon atoms
multiple peaks equal to the number of hydrogens on surrounding atoms
multiple peaks equal to the number of hydrogen on surrounding atoms, plus one

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