You can see the cells in some fruit: they're hard,
granular things because they have cell walls.
The way that a knife works is that it applies
force over a very small area (the blade of the
knife). This causes a tremendous pressure, which
drives the matter on either side of the pressure
point apart, thus cutting it. A knife cannot cut
anything smaller than the blade of a
knife.Since knives are made out of atoms, they
can't cut atoms.
The splitting of atoms in atomic bombs happens
as a result of a different process. Only some
specific elements of atoms (and even then only
specific isotopes) can do this, and it happens
when they are struck by neutrons, which are
particles smaller than an atom. However, even
these atoms can't be cut with a knife, because the
atoms are smaller than the knife is.
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