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Washington, Sept 28 : Men need to be cautious about taking multivitamins more than once a day, for a new study has found doing so may increase the risk of prostrate cancer.

The researchers conducting the study also found that though there was no link between multivitamin use and the risk of developing localized prostate cancer, men who took multivitamins more than once a day were 32 percent more likely to develop advanced prostate cancer.

They also found that such men were 98 percent more likely to die from the disease.

Washington, Sept 28 : Pennsylvania State University researchers have sequenced the DNA of 10 woolly mammoths that died 50,000 years ago, using a technique that could revolutionize genetic testing of extinct creatures.

In their study, ‘Whole-Genome Shotgun Sequencing of Mitochondria from Ancient Hair Shafts’, the scientists describe how the hair shafts of extinct animals can provide an ideal source of ancient DNA.

Washington, Sept 28 : Pakistan and Russia are the two most vulnerable countries to nuclear theft, according to a new report by a prestigious Washington think-tank.

The report by the group called Nuclear Threat Initiative (NTI) says that of the states that have either nuclear weapons or significant amounts of high-quality weapons-usable materials, only Pakistan fares as poorly as Russia in Transparency International’s ratings of corruption levels.

Washington, Sept 28 : Carbon dioxide did not cause the end of the last ice age, according to new study by a University of Southern California geologist.

Deep-sea temperatures rose 1,300 years before the rise in atmospheric CO2, ruling out the greenhouse gas as driver of meltdown, Lowell Stott said in his study published online Sept 27 in Science Express.

Coimbatore, Sept. 28 : The Special Sessions Court will begin delivering the sentences in the 1998 Coimbatore serial bomb blasts case from today.

Of the 166 accused, the court had convicted 158 on various charges, including the founder of the Al-Umma, Syed Ahmed Basha and its General Secretary, Mohammed Ansari. Of this, the court had found 70 of the accused guilty on various grounds, including conspiracy.

The court had acquitted Abdul Nasser Madani, the leader of the Kerala-based People's Democratic Party. The court had also given bail to seven others.

Washington, Sept 28 : A new NASA funded research has pushed back the timeline for presence of oxygen in the Earth’s atmosphere by 50-100 million years before the Great Oxidation Event.

The event happened between 2.3 and 2.4 billion years ago, when many scientists think atmospheric oxygen increased significantly from the existing very low levels.

As part of their study, the scientists analysed a kilometre-long drill core from Western Australia, representing the time just before the major rise of atmospheric oxygen.