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Ancient
under frozen ground could contain many
diseases. The
have been trapped for
in permafrost. This is ground that stays completely
for at least two years. It is common in
and near the North and South Poles. The permafrost is melting because of climate change. The result could be the
of unknown, harmful
. Scientists are calling these 'Factor X'. A professor in
diseases said we know little about Factor X and the biological
trapped in Earth's permafrost.
