The Week in Pictures: From Protests in Israel to Venezuelan Soccer

Researchers from the Vienna University of Technology have set a new world speed record for creating 3D nano objects. The University team create their grain of sand-size structures in just four minutes, a fraction of the time that other items have previously been printed. Previously making complex large 3D structures would take hours or even days but with the newly developed 3D laser printer the scientists can speed that up by a factor of 500 or in some cases 1,000 times. The process called ?two-photon lithography? involves using a focused laser beam to harden liquid resin in order to create micro objects of solid polymer. The scientists said the technique could be developed to make small biomedical parts to be used by doctors. B/W ONLY

Israeli security forces fired rubber bullets, tear gas and stun grenades to break up groups of Palestinian stone-throwers on Friday as annual Land Day rallies turned violent. Police said they had made five arrests at Damascus Gate. Land Day commemorates the killing by security forces of six Arabs in 1976 during protests against government plans to confiscate land in northern Israel's Galilee region.

U.S. President Barack Obama smiles while at Southern Maine Community College in Maine, March 30, 2012.

Researchers from the Vienna University of Technology have set a new world speed record for creating 3D nano objects. The University team create their grain of sand-size structures in just four minutes, a fraction of the time that other items have previously been printed. Previously making complex large 3D structures would take hours or even days but with the newly developed 3D laser printer the scientists can speed that up by a factor of 500 or in some cases 1,000 times. The process called ?two-photon lithography? involves using a focused laser beam to harden liquid resin in order to create micro objects of solid polymer. The scientists said the technique could be developed to make small biomedical parts to be used by doctors. B/W ONLY

Goalkeeper Alvaro Forero (bottom) of Venezuela's Zamora FC fights for the ball with Wellington Nem of Brazil's Fluminense during their Copa Libertadores soccer match in Barinas March 29, 2012.