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Archaeologists think they have some responses for the hypothesis that our early forebears were forced out of the trees and onto two feet when climate change reduced tree cover.

Our earliest ancestors changed from tree dwelling quadrupeds to upright bipeds capable of walking and scrambling and the authors in Antiquity ('Complex Topography and Human Evolution: the Missing Link') say our upright gait may have its origins in the rugged landscape of East and South Africa, which was shaped during the Pliocene epoch by volcanoes and shifting tectonic plates.

As men get older they are more likely to suffer from andropausal syndrome (AS), also known as 'menopause' and by other complicated terms 'androgen deficiency in the aging male' or' late-onset hypogonadism'.

Men with andropausal syndrome have decreased levels of anabolic hormones, including testosterone, and it has been suggested that these hormone deficiencies are what cause the clinical symptoms.

Saturn's moon Titan might be in for some wild weather as it heads into its spring and summer, if two new models are correct.

Scientists think that as the seasons change in Titan's northern hemisphere, waves could ripple across the moon's hydrocarbon seas, and hurricanes could begin to swirl over these areas, too. The model predicting waves tries to explain data from the moon obtained so far by NASA's Cassini spacecraft. Both models help mission team members plan when and where to look for unusual atmospheric disturbances as Titan summer approaches.

Ernie Pyle, the iconic embedded World War II embedded journalist killed by Japanese machine gun fire in 1945, made famous the adage, "There are no atheists in foxholes." 

He was making a point that it's better to be safe than sorry when your life is on the line - not letting the Devil get you cornered, he wrote, was the justification for a soldier who dug round foxholes. Atheists are a tiny minority anyway and there are even fewer in a war zone, Pyle felt. And he knew more soldiers than perhaps any journalist ever will.

A 12-year study (1999 to 2010) analyzed fatality reductions in bicycle-car collisions to determine the effect of mandatory helmet laws. 16 states had bike helmet laws in the beginning or the study. The researchers identified all relevant fatalities, totaling 1612, in states with and without bike helmet laws.
  

Relevance was determined by adjusting for factors previously associated with rates of motor vehicle fatalities (elderly driver licensure laws, legal blood alcohol limit and household income) and, among those, they found that the adjusted fatality rate was significantly lower in states with helmet laws. On average, 900 people die annually in bicycle-motor vehicle collisions — three quarters of those are from head injuries. 

Is the obesity epidemic due to the addictive qualities in food or that a lot more food is cheap and plentiful than ever before in history?

A paper presented at the 2013 Canadian Neuroscience Meeting, the annual meeting of the Canadian Association for Neuroscience - Association Canadienne des Neurosciences (CAN-ACN), says the problem is addiction rather than food wealth - the authors claim that high-fructose corn syrup can cause behavioral reactions in rats similar to those produced by drugs of abuse such as cocaine.  It's the "Food Addiction" hypothesis that has recently become popular, which posits that we could be addicted to food just like drugs.