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This is Scientific Americans' 60 Second Science.

I'm Adam Levy.

On September 20th, 2017, a huge storm, Hurricane Maria, made landfall on Puerto Rico.

While the initial estimates suggested around 60 people lost their lives as a result of this horrific hurricane,

the official figure was

later raised to the thousands.

We've all seen it on the news, right? We all watched how, you know, or heard about

how people didn't have power for, you know, a month after, three months, six months, a year

after, apparently there's still some people on the island that still don't have power.

David Keelings, a geographer at the University of Alabama.

With the cost to America of $90 billion,

Hurricane Maria was the third most financially destructive in U.S. history.

But just how unusual was its intensity?

Keelings set out to compare Maria to all the other storms that have hit Puerto Rico

since records began in 1956.

Maria is more intense than any one of those other 128 storms that we have in the record.

...