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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These Simple Rules Will Help You Prevent Food Poisoning

Everyone knows that it is recommended to wash fruits and vegetables before eating, but what about chicken and meat? 

So many think they should be washed with water - but according to the experts, the opposite is true. If you want to avoid food poisoning - these are the rules you need to follow.

food and poison

Fruits and vegetables - wash, chicken and meat - do not wash 

According to the US Department of Agriculture, the chicken and meat must not be washed with water before cooking. 

It turns out that when it comes to fresh meat, this action can actually spread more harmful bacteria than reduce them. 

Food poisoning is very common and can be especially dangerous for pregnant women and people with weak immune systems. Here's what you need to do in the kitchen to avoid poisoning food.

According to experts, consumers should wash fruits and vegetables with cold water, but not fresh meat and poultry. 

In fact, it seems that for a long time consumers have been cautioned against washing meat with water and chicken before cooking, but the habit seems to be stronger.

The Centers for Disease Control and Prevention in the United States (CDC) claim that 48 million Americans are affected each year by food poisoning caused by disease-causing bacteria, which lead to 128,000 hospitalizations and 3,000 deaths a year. 


Foods like lettuce and spinach that come packaged in advance and washed with water in advance. The dilemma is, of course, whether to rely on what is written or wash for good measure? 

According to the FDA, there is no need to wash these products. It turns out that washing these products will not reduce the amount of harmful bacteria, but may actually spread them even more throughout the kitchen.

According to Benjamin Chapman, associate professor in the Department of Agriculture and Human Sciences at the State University of North Carolina. 


Washing chicken in water will not remove most of the bacteria, but it can spread bacteria through hands, work surfaces, clothes, utensils used in the kitchen and other foods found Near the washing area.

Cooking temperature is just as important

A good option to prevent the presence of harmful bacteria in our food is of course to cook it well. Cooking is the only way to kill pathogens like Salmonella.

Use a cooking thermometer to make sure that chicken and meat are cooked at the right temperature. About 74 degrees Celsius fly, 71 degrees Celsius for ground beef, 62 degrees Celsius for steaks, ribs, roast and fish.

It is recommended to keep separate items such as raw meat and poultry from fruits and vegetables. Both in the shopping bag and in the fridge / freezer. 


In addition, it is important to clean any surface you used during preparation, like cutting boards and other tools. It is recommended to clean both before and after preparing the food.

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