The largest rodent ever to have lived may have used its front teeth just like an elephant uses its tusks, a new study led by scientists at the University of York and The Hull York Medical School (HYMS) has found.

Josephoartigasia monesi, a rodent closely related to guinea pigs, lived in South America approximately 3 million years ago. It is the largest fossil rodent ever found, with an estimated body mass of 1000 kg and was similar in size to a buffalo.

Dr Philip Cox, of the Centre for Anatomical and Human Sciences, a joint research centre of the University's Department of Archaeology and HYMS, used computer modelling to estimate how powerful the bite of Josephoartigasia could be.

Relative sea-level rise has been a major factor driving the evolution of reef systems during the Holocene.

Most models of reef evolution suggest that reefs preferentially grow vertically during rising sea level then laterally from windward to leeward, once the reef flat reaches sea level.

Browsing Facebook has become a daily activity for hundreds of millions of people. Because so many people engage with the website daily, researchers are interested in how emotionally involved Facebook users can be with the social networking site and how regular use can affect their mental health.

Now, journalism scholars at the University of Missouri did a survey of more than 700 college students and found that Facebook use can lead to symptoms of depression if the social networking site triggers feelings of envy among its users. Margaret Duffy, a professor and chair of strategic communication at the MU School of Journalism, says that how Facebook users use the site makes a difference in how they respond to it.

Micro-imprinting and electro-spinning techniques have led to the ability to create a vascular graft composed of three layers and this tri-layer composite means the ability utilize separate materials that respectively possess mechanical strength and promote new cell growth - a significant problem for existing vascular grafts that have only consisted of a single or double layer.

One in three people say they would risk living a shorter life instead of taking a daily pill to prevent cardiovascular disease, according to new research.

The scholars surveyed 1,000 people (average age 50) via the Internet hypothetically asking how much time they were willing to forfeit at the end of their lives to avoid taking daily medication.

They were also asked the amount of money they would pay and the hypothetical risk of death they were willing to accept to avoid taking medications to prevent cardiovascular disease.

The survey showed:

Does only spending what you make lead to suicide? In the world of weak observational studies, it can. Suicides in Greece reached a 30 year all-time high in 2012, with a sustained upward trend starting in June 2011, the month that the government introduced austerity measures to get loans and help pay down the country's debts, currently at 175 percent of GDP and caused by overspending on social services.