Sperm is implanted into an egg in the process of artificial insemination. Credit: Dreamstime.
X-47B Northrop Grumman 
This image shows a smoothed reconstruction of the total (mostly dark) matter distribution in the COSMOS field, created from data taken by the NASA/ESA Hubble Space Telescope and ground-based telescopes. It was inferred from the weak gravitational lensing distortions that are imprinted onto the shapes of background galaxies. The color coding indicates the distance of the foreground mass concentrations as gathered from the weak lensing effect. Structures shown in white, cyan and green are typically closer to us than those indicated in orange and red. To improve the resolution of the map, data from galaxies both with and without redshift information were used. The new study presents the most comprehensive analysis of data from the COSMOS survey. The researchers have, for the first time ever, used Hubble and the natural "weak lenses" in space to characterise the accelerated expansion of the universe. Credit: NASA, ESA, P. Simon (University of Bonn) and T. Schrabback (Leiden Observatory)
Scientists contend that recent human activity, including stunning population growth, sprawling megacities and increased use of fossil fuels, have changed the planet to such an extent that we are entering what they call the Anthropocene (New Man) Epoch. (Credit: iStockphoto)
The Golden Gate Bridge after lights out, during Earth Hour 2008 in San Fransisco, Calif. Credit: © John Storey / WWF-US
Gerald Blanchard could hack any bank, swipe any jewel. There was no security system he couldn't steal. Illustration: Justin Wood
Microsoft has rejected criticism of its compliance with China’s strict internet laws. Photograph: Claro Cortes/Reuters
Moderate-intensity activity was defined in the study as walking or hiking, jogging, running, bicycling, aerobic exercise or dance, use of exercise machines, yoga, tennis, squash, racquetball and swimming. (Mark Boster / Los Angeles Times)
Photo: Francisco J. Ayala
Rangers observe a mountain gorilla in the Democratic Republic of the Congo's Virunga National Park. Photograph by Brent Stirton, National Geographic Stock
Getting round the censors (Image: Ng Han Guan/AP/PA)
The Compact Muon Solenoid (CMS) experiment at the CERN laboratory. (Credit: Courtesy of CERN)
The fossil was uncovered in Dinosaur Cove, Australia. This map shows the location of Dinosaur Cove approximately 110 million years ago. Credit: Roger Benson, University of Cambridge.
From CNET:
A railroad worker in Australia takes a break from the heat. Photograph by William Albert Allard, National Geographic StockGlobal warming could make the world a more violent place, because higher temperatures increase human aggression and create volatile situations, a new study says.
The report combined government data about average yearly temperatures with statistics on the number of violent crimes committed between 1950 and 2008.
From The threat Level:
The first images of supernova SN2007if - the faint host galaxy could not be made out at the time the supernova was discovered. Credit: NBNL
Freezing depends on impurities (Vilhjalmur Ingi Vilhjalmsson/Getty)
Image: The finding may offer a new strategy for fighting cancer (Source: iStockphoto)
Photo: Pedram Amini and Aaron Portnoy of TippingPoint look over Charlie Miller's shoulder as he conducts his Safari hack. (Credit: Elinor Mills/CNET)
From ABC News:
From The Daily Mail:
Tracking from Above It's difficult to use radar in urban environments because of all the structures that get in the way. But by bouncing highly sensitive radar off of buildings' facades, DARPA hopes to lock onto individual vehicles from UAVs and track them through urban streets even when buildings block line of sight. Zemlinki 
Let your body do the thinking (Image: Stephen Simpson/Image Bank)
New research suggests that hand sanitizers containing ethanol are much more effective at removing rhinovirus from hands than washing with soap and water. (Credit: iStockphoto/Janine Lamontagne)
Two males of dung beetle called Onthphagus taurus size up each other's horns.
From The BBC:
U.S. Federal Trade Commission investigators Sheryl Novick (L) and Martha Vera look at images (top half of monitors) as part of their investigation of the scareware company Innovative Marketing Ukraine (IMU) in the FTC internet lab in Washington March 22, 2010. Credit: REUTERS/Molly Riley
Changes: Dinosaurs came to rule the world as a direct result of a
A young star with planets forming, illustrated here, may retain chemical clues about the worlds that surround it. ESO/L. Calçada
Opportunity Target Selection Opportunity scans the Martian terrain for rocks meeting specific criteria – shape, size, coloration – set by scientists on the ground. When it finds what it's looking for, it sets a course for the point of interest. NASA/JPL-Caltech 
(Image: NASA / JHU-APL / Southwest Research Institute)
From Space.com:
CAVE OF MYSTERIES: Mitochondrial DNA analysis of a finger bone found in Denisova Cave in the Altai Mountains of southern Siberia suggests that a group of unknown hominids ventured out of Africa less than a million years ago. J. Krause
From Boston.com:
The "Venus of Brassempouy," a tiny ivory figurine, is among artifacts that scientists could analyze with a new method for determining the age of an object without damaging it. (Credit: Wikimedia Commons)
After 72 hours of exposure to ambient light, strands of nanoparticles twisted and bunched together. Credit: Nicholas Kotov
Livestock's Long Shadow calculated meat-related emissions from field to abattoir
Image: Rentalic, which lets people rent stuff to each other with security deposits and blackout dates for when owners wants to use their items, claimed top honors in the PayPal X Developer Challenge.
Geothermal Hot Spots: Many hot spots sit in seismically active areas. Paul Wootton
Distant galaxy SMM J2135-0102 went through a massive 'growth spurt' Photo: ESO/PA 
Happy: But money counts for little unless you are richer than your friends
Keep moving to fix a position (Image: Chad Hunt/Corbis)
From The BBC:
John Hoopes, University of Kansas associate professor of anthropology and director of the Global Indigenous Nations Studies Program, recently returned from a trip to Costa Rica where he and colleagues evaluated ancient stone spheres for UNESCO, the United Nations cultural organization that might grant the spheres World Heritage Status. (Credit: Courtesy of John Hoopes)
The June 12, 1991 eruption column from Mount Pinatubo, Philippines, as seen from Clark Air Base. credit: Richard P. Hoblitt/USGS