All Sauce from Weekly Sauce:

Stuttering is a neurological condition, not a psychological one, and scientists in Finland now believe they’ve found the disrupted network in the brain that may cause it. “These findings explain well-known features of stuttering, such as the motor difficulties in speech production and the significant variability in stuttering severity across emotional states,” said senior study…  read on >  read on >

A “Third Thumb” — a robotic, prosthetic extra thumb — is easy to use and can help folks grab and tote more objects, a new study says. Hundreds of diverse test subjects at a science exhibition were able to figure out the extra thumb quickly and use it to pick up things like pegs and…  read on >  read on >

The old joke holds that fatherhood causes a man’s hair to go prematurely gray. Whether or not that’s true, being a father does appear to put men at greater risk of poor heart health later in life, a new study finds. Dads tended to have worse heart health than men without kids, based on factors…  read on >  read on >

Folks typically think of heart disease as a byproduct of modern fast-food living, but a new study shows the condition has plagued humanity for centuries. More than a third (37%) of 237 adult mummies from seven different cultures spanning more than 4,000 years had evidence of clogged arteries, CT scans revealed. Researchers say the results…  read on >  read on >

U.S. girls are getting their periods at younger ages, a new study has found. Girls born between 2000 and 2005 started their periods at an average age of 11.9 years — a half year earlier than the average age of 12.5 years for girls born between 1950 and 1969, researchers reported May 29 in the…  read on >  read on >

Feeding kids peanuts early in childhood can drastically reduce their risk of developing a peanut allergy, a new clinical trial reports. Children regularly fed peanut products from infancy to age 5 had a 71% lower rate of peanut allergies by the time they reached their teen years, researchers reported May 28 in the journal NEJM…  read on >  read on >

Near-infrared light pulsing into a person’s skull appears to boost healing in patients with a severe concussion, a new study finds. Patients who wore a helmet emitting near-infrared light displayed a greater change in connectivity between seven different pairs of brain regions, researchers report. “The skull is quite transparent to near-infrared light,” explained co-lead researcher…  read on >  read on >