SciNews Sunday, February 21, 2016


Interbreeding of homo sapiens and Neanderthals; chubby King penguins; frozen for 30 years and revived; 3D printed tissues grow and develop; colliding black holes; Stonehenge the cemetery- just a few of the themes in today’s eclectic collection of SciNews.  Share these stories with your students and get them excited about science.

SciNews is published twice weekly. Stay tuned for more.

7308778_s from 123rfBiology

Neanderthal, human interbreeding reveals mysterious migration. CBC

Research showing that our species interbred with Neanderthals some 100,000 years ago is providing intriguing evidence that Homo sapiens ventured out of Africa much earlier than previously thought, although the foray appears to have fizzled.

Scientists said on Wednesday an analysis of the genome of a Neanderthal woman whose remains were found in a cave in the Altai Mountains in southern Siberia near the Russia-Mongolia border detected residual DNA from Homo sapiens, a sign of inter-species mating.  Read more…

Chubby king penguins wobble when they waddle. Science News

King penguins excel at swimming. With such short legs, walking is not their forte and drains a lot of energy. Yet, every summer king penguins come ashore and trek inland to breed. They can’t forage during that time, so they pack on the pounds before coming ashore and then fast while on land.  Read more…

Animals revived after being in a frozen state for over 30 years. Science Daily

Microscopic tardigrades, also known as ‘water bears,’ were successfully revived and reproduced after being frozen for over 30 years.

Tardigrades (water bears) were successfully revived and reproduced after having been frozen for over 30 years. A moss sample collected in Antarctica in Nov. 1983, stored at -20°C, was thawed in May 2014. Two individuals and a separate egg retrieved from the thawed sample were revived, thereby providing the longest record of survival for tardigrades as animals or eggs. Subsequently, one of the revived tardigrades and the hatchling repeatedly reproduced after recovering from their long-term cryptobiosis.  Read more…

Chemistry

13698187_s from 123rf

3D printed tissues grow and develop in animal tests. Chemistry World

A new 3D printing system developed by researchers in the US comes closer than ever before to printing tissues and organs that could be transplanted into patients to replace missing or injured body parts. The researchers demonstrated they could print three different tissue types – bone, muscle and a human-scale ear made of cartilage – that continue to survive and develop several weeks after being transplanted into animals.  Read more…

Physics

18685938_s from 123rf

Black hole heavyweights triggered gravity wave event. Science News

The recent detection of gravitational waves is a stunning confirmation of Albert Einstein’s theories and the start of a new way of observing the universe. And at the center of it all is a celebrity couple: the first known pairing of black holes and the most massive ones found outside of the cores of galaxies.  Read more…

Earth and Space Science12693495_s from 123rf

This recent discovery at Stonehenge clears up a huge misconception about the monument. Business Insider

Fourteen women and nine men were found in a cremation burial near Stonehenge. These findings help support the theory that Stonehenge functioned as a cremation cemetery for people of high status.  Read more…

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