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\centerline{\bf DNA Hash Pooling and its Applications}
Dennis Shasha \\
Courant Institute of Mathematical Sciences\\
New York University\\
shasha@cs.nyu.edu\\

Martyn Amos \\
Department of Computing and Mathematics\\
Manchester Metropolitan University \\
M.Amos@mmu.ac.uk\\
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\centerline{\bf The Challenge}

In ecological systems (human gut, lakes), want to answer questions such as
\begin{itemize}
\item
(Genome Detection)
Is some known genome sequence
present at least in part in an environmental sample?
\item
(Similarity
Discovery) How similar 
are two unsequenced samples in terms of sequence content?
\end{itemize}
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\centerline{\bf Existing Methods}

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{\bf Two-stage hash pooling}
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