WEDNESDAY, Feb. 13, 2019 (HealthDay News) -- In the race to conception, the female body is set up to separate weak sperm from strong, researchers report.
A woman's reproductive system presents a veritable obstacle course that stress-tests sperm, making sure that only the strongest swimmers have a chance of reaching a woman's egg, according to a new study.
WEDNESDAY, Oct. 31, 2018 (HealthDay News) -- The earliest evidence of lead exposure has been discovered in 250,000-year-old teeth from the remains of two Neanderthals found in southeastern France, researchers say.
"Traditionally, people thought lead exposure occurred in populations only after industrialization, but these results show it happened prehistorically, before lead had been w...
FRIDAY, July 13, 2018 (HealthDay News) -- New research suggests that no two brains are alike, as genetics and experience make their mark on your mind.
"With our study, we were able to confirm that the structure of people's brains is very individual," said study author Lutz Jancke. He is a professor of neuropsychology at the University of Zurich in Switzerland.
WEDNESDAY, July 11, 2018 (HealthDay News) -- For seniors who feel years younger than they really are, a new study suggests it might not be their imagination.
"We found that people who feel younger have the structural characteristics of a younger brain," explained lead author Jeanyung Chey. She is a professor in the department of psychology & program for brain sciences at Seoul Nat...
MONDAY, April 16, 2018 (HealthDay News) -- The color of your hair turns out to be a complicated thing, with a full 124 genes determining whether you wind up a blonde, brunette or redhead.
The researchers who pinpointed the origins of hair hue said their findings could improve understanding of health conditions linked to pigmentation, including skin, testicular, prostate and ovarian ca...
TUESDAY, March 27, 2018 (HealthDay News) -- Young children with attention-deficit/hyperactivity disorder (ADHD) have smaller-than-normal brain regions that are crucial in controlling behavior, researchers have found.
Along with conducting MRI brain scans, the researchers assessed the thinking skills and behavior of 90 children, ages 4 and 5.
WEDNESDAY, Dec. 6, 2017 (HealthDay News) -- Two years ago, Zion Harvey was the first child to undergo a successful double hand transplant. Now he's gaining notoriety for another milestone: the way his brain reorganized itself in response to the amputation and transplantation.
Harvey, now 10, lost both hands because of a severe infection in infancy. The brain rewired itself after the a...
TUESDAY, Nov. 21, 2017 (HealthDay News) -- Humankind long ago conquered the darkness with the invention of artificial light. But new research shows that, by and large, the sun's daily cycle still dictates people's activity.
Finnish researchers say most people still schedule their daily routines around the natural ebb and flow of daylight.
THURSDAY, Oct. 12, 2017 (HealthDay News) -- Humans come in a range of colors, and new research is getting a step closer to how that happens.
Newly identified gene variants tied to skin colors among Africans could offer insights into human evolution. The findings could also boost scientists' understanding of skin cancer and other conditions, researchers say.
WEDNESDAY, Sept. 13, 2017 (HealthDay News) -- Human semen provides a potential hiding place and breeding ground for a host of dangerous viruses, a new evidence review reports.
The analysis of current medical literature revealed genetic evidence of 27 infectious viruses found in semen, including dread-inducing agents like Zika, Ebola, Marburg, Lassa fever and chikungunya, along with ...
TUESDAY, Aug. 8, 2017 (HealthDay News) -- People with a particular genetic cause of autism show structural abnormalities in the brain that are readily detected with noninvasive imaging, according to a new study.
Using MRI brain scans, researchers found clear brain structure abnormalities in people with autism caused, in part, by defects in chromosome 16.
TUESDAY, June 13, 2017 (HealthDay News) -- A commonly used blood test that measures average long-term blood sugar levels -- called hemoglobin A1C -- is known to give higher readings for black people with diabetes, and now new research may indicate why.
"There has been a long debate about why African Americans have a higher hemoglobin A1C than whites [with diabetes]. Is it a biologica...
TUESDAY, April 4, 2017 (HealthDay News) -- At 89, Donald Tenbrunsel is a bit of a phenomenon. He surfs the internet with ease, happily converses on a broad range of timely topics, volunteers and reads regularly.
Known as a "SuperAger," Tenbrunsel was part of a study that helped researchers discover what factors might set these super-sharp seniors apart from their peers.