Earth Changes
Sex in the deep sea is a difficult proposition. The problems already begin with the partner search: How do you find someone to mate with in the pitch-black depths of the ocean? And for any creature that does manage to have a rendezvous beneath the waves, failure is simply not an option.
"Seize the moment," is how Dutch researcher Hendrik Jan Ties Hoving describes the most basic rule of undersea reproduction. "Chances are low of finding a partner a second time."
The quake was reported at 12:04 a.m. and lasted a few seconds. No damage was reported.
Harford County 911 officials confirm their 911 call center received "a few calls" from people in northern Harford County reporting that the ground shook around midnight.
The USGS said the quake was "widely felt" throughout southeastern Pennsylvania, from Hanover to the west to Harrisburg to the northeast.

Pedestrians take pictures as traffic lights, street lights and buildings are without power along Kalakau Ave. and the rest of Honolulu, Saturday, Dec. 27, 2008, during an extensive blackout on the island. The island of Oahu lost power Friday evening in the midst of heavy rain and lightning, leaving some 800,000 residents and thousands of tourists in the dark, as well as the neighborhood where President-elect Barack Obama was vacationing.
Residents were urged to stay home after the lights went out during a thunderstorm Friday evening and to conserve water.
Hawaiian Electric Co. spokeswoman Jan Loose said power had been restored to about 113,000 customers as 6 a.m., mostly on the west side of the island. The utility serves a total of 295,000 homes and businesses.
She said power to neighborhoods on the eastern shore, where Obama was staying with his family, would likely not be restored until later Saturday.
Scientists said that lava stopped flowing at what is known as the Thanksgiving Eve Breakout on Monday and started up again on Christmas Eve, the Honolulu Advertiser reported Friday.
The Sydney Morning Herald cited a scientific report which found that the impact of natural events such as earthquakes and tsunamis would in coming years be amplified by rising populations and climate change.
The paper said the report, by government body Geoscience Australia, had prompted Prime Minister Kevin Rudd and Indonesian President Susilo Bambang Yudhoyono to create a joint disaster training and research centre.
Geoscience Australia could not be reached for comment Friday.

FRIGID CONDITIONS: The temperature in Oymyakon, Siberia, could plunge to match (or exceed) the record minus 90 degrees Fahrenheit (minus 68 degrees Celsius) reached in 1933.
As winter sets in, the 800 hearty denizens of the coldest town on earth are bracing for one of the most frigid blasts yet, as forecasters predict that temperatures in Oymyakon, Siberia, could plunge to the coldest ever recorded in an inhabited location. There is no disputing that the mercury slides in Alaska and even in the Midwestern U.S. in the heart of winter. But if you want cold, visit Oymyakon, which this winter is expected to reach (or perhaps exceed) its record low temperature: a bone-chilling minus 90 degrees Fahrenheit (minus 68 degrees Celsius) reached on Feb. 6, 1933. It is a record matched only by nearby Verkhoyansk, Siberia, which endured minus 90 degrees Fahrenheit on Feb. 7, 1892.
The shutdown began on Thursday morning when ship pilots stopped steering vessels through the 60-mile waterway to refineries and petrochemical plants in Houston and Texas City, Texas, after fog reduced visibility to unsafe levels, the Coast Guard said.