Summly made a news aggregation app.

According to All Things D, Yahoo paid $30 million — 90 percent cash.

$30 million isn't much for Yahoo, which has more than $4 billion in cash (and access to much more).

But there are some elements to this deal that make even that small price seem strange.

Summly never really set the world on fire. It had fewer than one million downloads. Yahoo is shutting Summly down.