Was Rome’s fall due to heavy metal poisoning making Romans dumber?

Ice cores that preserve traces of atmospheric pollutants through history have revealed that industrial activity by Romans – particularly the use and production of lead – meant the air the Romans breathed was heavily contaminated. The levels were high enough to cause neurological problems, including a drop in cognitive function across the population. Joe McConnell and his team at the Desert Research Institute published their findings in the journal PNAS.

Bats are surfing storms to make migration easier

Migrating bats in Europe have to fly up to 2000km while pregnant, but they’ve figured out how to get a lift from the weather. The bats have been observed waiting for storm fronts, and then surfing the strong winds in front of the storm to save energy during their migration. Dina Dechmann from the Max Planck Institute of Animal Behaviour, and colleagues, were able to tag bats with tiny specialized sensors to track their nocturnal movements during migration. Their paper was published in the journal Science.

Squirrels have developed a taste for vole flesh

Squirrels in California have been taking advantage of a boom in the population of tiny rodents called voles – by hunting and eating them. This widespread carnivorous behaviour was captured for the first time on videos and photos by a team led by behavioural ecologist Jennifer Smith, as a part of a long-term study of the squirrels. The researchers found dozens of instances of the squirrels killing the voles, which they say changes our fundamental understanding of ground squirrels. Their paper was published in the Journal of Ethology.

EEG tattoos could outperform standard electrodes

EEG is a valuable technology that allows researchers to monitor the electrical activity of the brain, but standard EEG electrodes are cumbersome and are hampered by the difficulty of attaching them. A new temporary EEG tattoo, made by printing conductive ink on the scalp, could be a step ahead. Luize Vasconcelos, a postdoctoral fellow at the University of Texas at Austin helped create this ink. The research is published in the Cell Press journal Cell Biomaterials.

To monitor cat brain waves, researchers made them cute hats

Aude Castel, a veterinary neurologist from the Université de Montréal, and her team were studying chronic pain in cats — and ways to alleviate it — when she realized that she could crochet hats for the cats and add EEG electrodes to them in order to study their brains. Their research was published in the Journal of Neuroscience Methods.

When North America went to the dogs (or vice-versa)

Researchers examining canid bones from Alaska dating to the last ice age have been intrigued by the complex picture it shows of dog domestication at the time. Their findings were published in the journal Science Advances. Signs of the animals’ diet are preserved in the bones, and shows that humans were clearly feeding their dogs, a clear sign of domestication. François Lanoë from the University of Arizona led the work.