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Mike Theiss

A broken safety glass window frames a destroyed house after an EF5 tornado struck Greensburg, Kansas.

A Kansas vehicle license plate impaled on a tree after an EF5 tornado struck Greensburg, Kansas. Flying debris is the main cause of injuries and deaths in tornadoes.

An EF5 tornado threw a van into a hotel in Greensburg, Kansas. An EF5 tornado produces winds greater than 200 miles per hour (322 kilometers per hour), and can pick up and throw vehicles and destroy buildings with ease.

Piles of conch shells are left behind by those who fish them solely to collect the slug. Conch meat has typically been a more lucrative market, though shells and rare conch pearls are often sold to tourists and jewelers.

A woman shops for conch shells at a beach-side souvenir stand in Turks and Caicos. The conch meat and shell industries generate millions of U.S. dollars per year across the Caribbean.

A queen conch peers out from its shell. An icon of the Bahamas, conchs numbers are dropping because of overfishing.

Northern Lights display with strong light pillars appears during a geomagnetic solar storm on the south coast of Iceland.

The summit of Huayna Picchu, also known as Wayna Picchu, gives trekkers a bird's-eye view of Machu Picchu.