Have a Great Weekend!

• Since 2003, the number of underground tremors along a section of the San Andreas Fault has doubled. The same section produced a 7.8-magnitude earthquake in 1857, considered the last "big one" to hit the area. Scientists acknowledge they don't know what the rise in tremors signifies.
• Although there are no concrete numbers, experts estimate there are 300 active serial killers in the United States at any time.
• The "Big Freeze" - a term used by scientists to describe an ever expanding universe that ultimately drops in temperature - is the most commonly accepted theory on how the universe will end. Other theories include Heat Death (the universe contracts), the Big Rip (dark energy density increases, destroying all matter) and the Big Crunch (the Big Bang, but in reverse).
• In 1989, a 1,000-foot diameter asteroid missed the Earth by 400,000 miles. Had it flown by just six hours earlier, it would have struck the Earth causing an explosion the "equivalent of one Hiroshima-sized atomic bomb detonating every second for 50 days." Scientists estimate similar asteroids miss the Earth undetected every "two or three years."
• Last week, scientists discovered a new, medium-sized black hole. It is 500 times larger than the sun and has a gravitational pull so strong that nothing escapes it.
• Astronomers speculate Jupiter's gravitational pull will eventually pull Mercury out of its orbit and possibly hit Earth. If so, the explosion would be large enough to form another moon.
• About two million Americans are allergic to bee stings. In 2006, honey bees began disappearing throughout North America. Bees play a vital role in pollination. Their extinction could disrupt the food chain. A disruption in the food chain could lead to mass starvation and extinctions of other life forms including humans.
• In 1997, Russia informed the United Nations that 100 nuclear weapons were unaccounted for. In 2005, that number grew to 250.
• "Paris Hilton's My New BFF" began filming in Dubai last month.