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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What are the dangers of tattoo ink? | Long term effects of tattoos

Although it is increasingly common to fill your body with ink, many people do not know how their skin reacts after going under a needle.


What are the dangers of tattoo ink?. Long term effects of tattoos
What are the dangers of tattoo ink?. Long term effects of tattoos

Although it is becoming increasingly common to fill your body with ink, many people do not know how their skin reacts after getting a tattoo. 

In particular, health experts point out that inks can trigger allergic reactions, which could generally lead to minor but potentially serious complications.

You're introducing a foreign body through the skin and there are risks. "The body can sometimes react in many ways you never thought it would. Allergic reactions don't have to happen immediately, they can happen weeks or even decades later, according to the American Academy of Dermatology.

Beware of the Ink Color

These negative effects may depend on the color of the ink used. Many people report mild side effects, such as redness, swelling, or itching, on drawings made with the color red.

Similarly, several reports indicate that this hue may cause a severe allergic reaction, accompanied by blisters, flaking skin, and watery discharge combined with severe pain, hives, difficulty breathing, or a rapid heartbeat.

If you have the psoriasis gene you should avoid getting a tattoo. Dermatologists say it could trigger the disease

The process of getting a tattoo may be completely normal and pose no problem, but there may be something in the red pigment that your body simply does not accept, The truth is, if you've never been exposed to one before, there's no way you'll know before you get your tattoo.
Red ink may cause mild side effects such as redness, swelling, or itching. And the yellow color may increase the skin's sensitivity to the sun.
Regardless of colours, if you used an ink that your skin does not tolerate, it could cause neurodermatitis. This causes bubbles to form on the tattoo and the skin becomes "thick and leathery".

On the other hand, if you have the gene for psoriasis you must rethink the dream of immortalizing your dog in your body.  Dermatologists point out that tattoos could trigger the development of the disease.

Unfortunately, there is no method or tool available that can help predict whether everyone is predisposed to develop an allergic reaction to tattoos.

Dermatologists, in any case, recommend getting a very small test tattoo to see how the skin responds to the ink.

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