Though there are examples of fit older men, they are the exception, just as attractive young people are the exception. Yet in youth people just accept that, while in middle age men seem to take it more to heart, lowering their feelings of self-worth.

In youth, attractiveness can be dismissed as genetics. Later on it becomes inevitable due to age.

Some people believe the immune system is dormant when you are healthy and only kicks into action when a threat is present.

Biologically, nature is always trying to kill things, we are just evolved enough to dismiss most without issues, but your immune system is working even when you feel fine. A recent paper highlights how the immune system even causes the liver of the healthy body to produce an energy source called ketone bodies and how that takes place by letting the liver burn fat during fasting. 

Before the invention of modern science and technology, where many diverse foods can be grown in areas once considered inhospitable, the whims of nature determined what you ate, and if you ate at all. 

A recent study found that a virtual reality experience is able to reduce stress among COVID-19 frontline healthcare workers.

Galaxy clusters grow over time under gravity and, in the present-day universe, can contain hundreds or even thousands of galaxies, as well as hot gas and dark matter. As time goes by, their galaxies burn through the fuel available and evolve from vigorously star-forming galaxies into red and dead galaxies.

In the last few decades more has been learned about the impact of oral health on the entire human biological system. And more is being done to reduce factors that lead to an estimated 15 million babiesborn prematurely or preterm (defined as delivery before the 37th week of pregnancy) each year. Preterm babies are at greater risk of experiencing serious health problems.

Due to correlation between preterm births and poor oral care, researchers have looked at various ways to improve dental health during pregnancy, including “deep-teeth cleaning” like scaling and planing to remove plaque and tarter on the teeth and below the gum line, but that hasn't seemed to be very effective.