File this under 'That's not supposed to happen!': Scientists observed a metal healing itself, something never seen before. If this process can be fully understood and controlled, we could be at the start of a whole new era of engineering.
A team from Sandia National Laboratories and Texas A&M University was testing the resilience of the metal, using a specialized transmission electron microscope technique to pull the ends of the metal 200 times every second. They then observed the self-healing at ultra-small scales in a 40-nanometer-thick piece of platinum suspended in a vacuum.
Cracks caused by the kind of strain described above are known as fatigue damage: repeated stress and motion that causes microscopic breaks, eventually causing machines or structures to break. Amazingly, after about 40 minutes of observation, the crack in the platinum started to fuse back together and mend itself before starting again in a different direction.
"This was absolutely stunning to watch first-hand," says materials scientist Brad Boyce from Sandia National Laboratories. "We certainly weren't looking for it."
"What we have confirmed is that metals have their own intrinsic, natural ability to heal themselves, at least in the case of fatigue damage at the nanoscale."
These are exact conditions, and we don't know yet exactly how this is happening or how we can use it. However, if you think about the costs and effort required for repairing everything from bridges to engines to phones, there's no telling how much difference self-healing metals could make.
And while the observation is unprecedented, it's not wholly unexpected. In 2013, Texas A&M University materials scientist Michael Demkowicz worked on a study predicting that this kind of nanocrack healing could happen, driven by the tiny crystalline grains inside metals essentially shifting their boundaries in response to stress. READ MORE...
Summary: Appreciating the beauty in the smaller things in everyday life can contribute to a more meaningful existence, a new study reports.
Source: Texas A&M
Appreciating the intrinsic beauty in life’s everyday moments can contribute to a more meaningful existence, according to new research.
In a paper recently published in Nature Human Behavior, Joshua Hicks, a professor in the Texas A&M University Department of Psychological and Brain Sciences, says this may be a previously unaccounted for factor tied to perceptions of meaning.
“It might not relate to whether you matter in the grand scheme of things, but we’ve shown people who value the little things, like your cup of coffee in the morning or being mindful in conversations with others, tend to have a high sense of meaning in life,” he said.
Hicks studies existential psychology. Put simply, he aims to understand the “big questions” in life. He describes his main focus as the experience of life—studying people’s subjective feeling that their life has meaning.
Scholars like Hicks generally agree there are three main sources of a subjectively meaningful existence: coherence, or the feeling that one’s life “makes sense”; the possession of clear, long-term goals and sense of purpose; and existential mattering. This last factor, he says, is the belief that one’s actions matter to others.
What Hicks and his co-authors argue in their latest research is that appreciating and finding value in experiences, referred to as experiential appreciation, is a fourth fundamental pathway toward finding meaning in life.
Researchers measured this factor by asking study participants how strongly they identified with statements linked to finding beauty in life and appreciating a wide variety of experiences.
They were also asked to recall the most meaningful event of the past month, among other questions, with the goal of measuring experiential appreciation. Hicks described this series of experiments in a recent article he co-authored for Scientific American.
In each case, the results confirmed the original theory that appreciating small moments can make for a more meaningful life. READ MORE...
