Scientists introduced a device that creates holograms using ultrasound & polystyrene ball

Researchers at the University of Sussex in the UK have introduced technology that can create holograms using ultrasound and a 2mm polystyrene ball. They can move and interact with the observer.


Scientists called the new technology "multimodal acoustic trap display" (multimodal acoustic trap display, or MATD). Images are created between two horizontal plates on which many tiny ultrasound speakers are mounted. They create an inaudible sound field in which there is a "pocket" of low pressure, where a polystyrene ball enters. By moving the "pocket", you can move the ball, forming an image. Colors are added to the image using the projector.
Through careful monitoring of the ultrasound field, scientists can add sound effects and music to animated images. Vibrations can be adjusted to receive sound waves in the entire range of human hearing and, for example, to imitate clear speech. In addition, you can interact with images and even feel them in your own hands.



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Too little sleep? You are at Risk for a Heart Attack

US researchers who have tested thousands of adults have found that lack of sleep or excess sleep causes the heart to age significantly and increases the risk of cardiovascular disease.


What are the optimal sleep hours for reducing risk?

Too little sleep.

Adults who sleep too little are at high risk for a heart attack or stroke, scientists say, finding that the heart is aging as a result of lack of sleep. 

The researchers and their colleagues analyzed data from a survey of 12,755 participants between 2007 and 2014. Subjects were between 30 and 74 years old, with no history of heart disease and stroke.  Subjects were asked about their sleeping hours during the night.

Subjects were divided into five groups. About 13% have five or fewer hours at night, 24% have six hours, 31% have seven hours, 26% have 8 hours, and 5% have nine or more hours at night.

The researchers calculated their heart  age, according to their age, gender, blood pressure levels, whether they were treated with high blood pressure drugs, whether they smoked, whether they had diabetes or high lipid levels. 

In the next stage, the researchers processed the data and translated it into "years of heart age".

The age of the heart is determined by a risk profile set in 2008 in a large heart study called Framingham. 


The higher the age of a person, the greater the risk of heart disease. For example, when a 40-year-old has a 44-year-old heart rate determined by his risk factors (such as high lipids, diabetes, hypertension, and smoking), his heart is four years "older" of his chronological age.

The researchers found that those who slept seven hours a night had the lowest risk of heart injury, which accounts for 3.7 years of aging beyond the chronological age of the heart. In comparison, those who slept six or eight hours experienced heart aging over 4.5 years older than their chronological age. 

Those who slept five or fewer hours were at the highest risk of heart aging - 5.1 years older than the "real" age of the heart.

"Long periods of sleep deprivation have a negative effect on many cardiovascular systems," says team leader Kanehe Yang of the Center for Disease Control in Atlanta. 


"Studies have shown a significant link between duration of sleep and heart risk factors, including hypertension, smoking, high levels of cholesterol and obesity.

"Sleeping too much or too little increases the risk of health," the researchers said. "Calculation of sleep-time sleep may persuade more people, especially young people, to sleep at the optimal 7 hours a night."


How many hours should sleep at any age?

According to recent guidelines from the American Geriatric Association, lung medicine, psychiatry, and neurology, the experts say most of us sleep less than recommended and do not take the importance of sleep in our lives seriously enough.

In newborns, the guidelines recommend 14 to 17 hours of sleep per day. Babies aged 3 months or older need 12 to 15 hours of sleep a day.



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