It’s the most famous chord in rock 'n' roll, an instantly recognizable twang rolling through the open strings on George Harrison’s 12-string Rickenbacker. It evokes a Pavlovian response from music fans as they sing along to the refrain that follows:

"It’s been a hard day’s night
And I’ve been working like a dog"

The opening chord to "A Hard Day’s Night" is also famous because, for 40 years, no one quite knew exactly what chord Harrison was playing.

We know a lot about the lifestyles of dinosaur - where they lived, what they ate, how they walked - but not much was known about their sense of smell.  Until now.

Scientists at the University of Calgary and the Royal Tyrrell Museum are providing new insight into the sense of smell of carnivorous dinosaurs and primitive birds in a research paper published in Proceedings of the Royal Society B. The study, by paleontologist Darla Zelenitsky and Royal Tyrrell Museum curator of dinosaur palaeoecology François Therrien, is the first time that the sense of smell has been evaluated in prehistoric meat-eating dinosaurs. They found that Tyrannosaurus rex had the best nose of all meat-eating dinosaurs, and their results tone down the reputation of T. rex as a scavenger.

Could eating grapes help fight high blood pressure related to a salty diet? And could grapes calm other factors that are also related to heart diseases such as heart failure? A new University of Michigan Cardiovascular Center study suggests so.    The new study published in the October issue of the Journal of Gerontology: Biological Sciences  outlines the potential of grapes in reducing cardiovascular risk. The effect is thought to be due to the high level of phytochemicals – naturally occurring antioxidants – that grapes contain.

The study was performed in laboratory rats, not humans, so more research needs to be done.

A new study in the Canadian Journal of Economics outlines the first evidence on sexual orientation and economic outcomes in Canada. The study found that homosexual men have 12 percent lower personal incomes and lesbians have 15 percent higher personal incomes than heterosexual men and women.

Christopher S. Carpenter of The Paul Merage School of Business at the University of California Irvine used data from the Canadian Community Health Survey which includes standard demographic questions as well as self-reports on sexual orientation.

A new study in the Journal of Marital and Family Therapy explored how men and women perceive online and offline sexual and emotional infidelity. Results show that men felt sexual infidelity was more upsetting and women felt emotional infidelity was more upsetting.

Monica T. Whitty and Laura-Lee Quigley of Queen's University Belfast surveyed 112 undergraduate students and asked them questions about sexual and emotional infidelity both offline and on the internet. 

When given the choice, men were more upset by sexual infidelity and women were more upset by emotional infidelity. 

A quarter-million people were killed when a tsunami inundated Indian Ocean coastlines the day after Christmas in 2004. Now scientists have found evidence that the event was not a first-time occurrence.

A team working on Phra Thong, a barrier island along the hard-hit west coast of Thailand, unearthed evidence of at least three previous major tsunamis in the preceding 2,800 years, the most recent from about 550 to 700 years ago. That team, led by Kruawun Jankaew of Chulalongkorn University in Thailand, included Brian Atwater, a University of Washington affiliate professor of Earth and space sciences and a U.S. Geological Survey geologist.