A "100-year flood" means a 1% chance of that level of flooding happening each year. Houston saw three 500-year flood events within three years from 2015 to 2017, including Hurricane Harvey.

Weather forecasters sometimes warn of storms that unleash rains so unusual they are described as 100-year or even 500-year floods. Here’s what to know about how scientists determine how extreme ...

An endangered giant tortoise has become the oldest first-time mom of her species after having her first babies at around 100 years old. Philadelphia Zoo recently hatched eggs laid by an elderly ...

Weather forecasters sometimes warn of storms that unleash such unusual rain they are described as 100-year or even 500-year floods. Here’s what to know about how scientists determine how extreme ...

A 500-year flood means such an event has a 1 in 500 chance, or 0.2%, of occurring in a year. Another concept scientists use is how frequently an event of a certain intensity is expected.

“Most 100-year-olds probably can’t get up out of bed for 20 minutes,” added Aramis Pettinato, 25, of Staten Island, “and she’s doing a show for an hour and a half, singing and hitting ...

With the defeat, Boston is one loss away from matching the franchise’s all-time record of 11 straight losses, set during their inaugural 1924-25 season, exactly 100 years ago. The Bruins are 0-9 ...

Western Santa Cruz Galapagos tortoises Mommy and Abrazzo, both estimated to be 100 years old, are the proud parents of four hatchlings. “This is a significant milestone in the history of ...