Many proteins and other functional molecules in our bodies display a striking characteristic: They can exist in two distinct forms that are mirror images of each other, chirality or "handedness", like your right hand and left hand, and each of our bodies prefers only one of these molecular forms. 

Researchers have been exploring how and why chirality arises, and new findings on the physical origins of the phenomenon were published in Nature Communications. 

The sexual maturation of female mice has been linked to longevity by researchers. 

They had previously established that mouse strains with lower circulating levels of the hormone IGF1 at age six months live longer than other strains. In new work, scientists report that females from strains with lower IGF1 levels also reach sexual maturity at a significantly later age. 

The researchers conclude that IGF1 may co-regulate female sexual maturation and longevity. They showed that mouse strains derived from wild populations carry specific gene variants that delay sexual maturation, and they identified a candidate gene, Nrip1, involved in regulating sexual maturation that may also affect longevity by controlling IGF1 levels.

Are modern Jews a ‘race’—the descendants of an ancient tribal people, as Biblical lore has it? Or do they trace their ancestry to Eurasia as Shlomo Sand, author of The Invention of the Jewish People, and Arthur Koestler in The Thirteenth Tribe, claim?

The latest DNA research offers extraordinary insights into the origins of the Jewish people and its impact on each of us. I addressed this controversy a few years ago in my book, Abraham’s Children: Race, Identity and the DNA of the Chosen People.

For our frugal parents in the late 1960's, pressure cookers and mason jars were not an option. In fact, since our tomato-dominated gardens couldn't provide the needed volume, our extended family drove to farms to pick more tomatoes, often overfilling allotted baskets.

Then back home, not for ecological reasons but strictly to lower costs, any glass container in sight was recycled, filled with crushed tomatoes and topped with a basil leaf. Jars and bottles were placed in big oil drums, and fires were lit in the fields behind our suburban homes so we could preserve sauce for the long, upcoming winter.

Proteins are large, organic - in the science sense of organic, not the food marketing sense -  molecules that help us to convert food into energy, supply oxygen to our blood and muscles and drive our immune systems. 

Proteins consist of one or more polypeptides, chains of amino acids held together by peptide bonds. If a protein in water is heated to temperatures approaching the boiling point of water, these chains will lose their structure and the protein will denature (unfold). 

Gene expression is impacted by social dominance?  A study of rhesus macaques published in  Proceedings of the National Academy of Sciences says a female's social status affects how her genes turn on and off, and those who rank higher tend to be healthier - unless their social status declines.

Vincent van Gogh's series of sunflower paintings, while spectacular to fans of his work, have also intrigued scientists because they depict a mutation whose genetic basis was a mystery. In a new study, a team of University of Georgia scientists reveal the mutation behind the distinctive, thick bands of yellow "double flowers" that the post-Impressionist artist painted more than 100 years ago.

You may have heard about certain potential dangers of nanotechnology; I like to write about some of them on occasion; and you probably know about the almost lost battle against so called superbugs, those pesky bacteria that evolved in hospitals to become resistant against all our drugs. Now combine these for something a little more scary: Fast-track evolution towards superbugs.