LOS ANGELES -- NASA's Curiosity rover has found the highest amounts of clay minerals since its landing on Mars in August 2012, according to a release of NASA on Wednesday.

Two samples the rover recently drilled at rock targets called "Aberlady" and "Kilmarie" have revealed the highest amounts of clay minerals ever found during the mission, said the release. (NASA-Curiosity-Clay Minerals)

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WASHINGTON -- John Bel Edwards, the Democratic governor in southern U.S. state of Louisiana, on Thursday signed into law a bill banning abortions after a fetal heartbeat is detected, which can occur at about six weeks of pregnancy.

With his signature, the governor broke from his party's ideology and makes Louisiana the sixth state to pass the so-called heartbeat abortion ban, joining Georgia, Mississippi, Kentucky, Ohio and Missouri. He is the first Democratic governor to sign such a ban. (US-Louisiana-Abortion Ban)

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BAGHDAD -- At least four people were killed and 20 others injured on Thursday when six explosions rocked the Iraqi northern city of Kirkuk, a police source said.

The blasts took place when six roadside bombs went off in three main streets in Kirkuk, some 250 km north of the Iraqi capital Baghdad, the media office of the Joint Operations Command said in a statement. (Iraq-Attacks- Casualties)

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WASHINGTON -- U.S. and Chinese researchers used a laser technique to transform graphene, a super thin material that is at least 100 times stronger than steel, into a semiconductor that may replace silicon on a computer chip in the future.

Researchers from the Purdue University, the University of Michigan and the Huazhong University of Science and Technology used a technique called "laser shock imprinting" to permanently stress graphene into having a structure that allows the flow of switching electric current, according to the study published in the latest journal Advanced Material. (US-Science-Graphene) Enditem

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