When I click on your link the top entry says:<p><pre><code> The second largest desert is the Arctic,
with 13.7 million square km. The third
largest desert in the world is the more
familiar Sahara, with a total size of
9.1 million square km. Antarctica is
the coldest, windiest, and most isolated
continent on Earth.
</code></pre>
That clearly implies that Antarctica is the largest desert. It's then accompanied by an image showing a map of Antarctica.<p>Why are you saying that Google doesn't know what the largest desert is? It clearly does - it's Antarctica.