Why Surgical Lights Cast No Shadows

Bright Side

Surgical lights are designed to cast no shadows because they use multiple beams of light that overlap from different angles, making sure there are no dark spots during surgeries. Another cool science mystery is metamaterials—these are special materials that can bend light in weird ways, even making things appear invisible! Then there's the futuristic "fishnet," a type of material that could lead to invisibility cloaks by guiding light around objects. And have you ever heard of color-changing ice cream? It reacts to temperature and chemicals in your mouth, so it changes color as you eat it! These mysteries show just how fascinating and surprising science can be!  Animation is created by Bright Side. ---------------------------------------------------------------------------------------- Music from TheSoul Sound: https://thesoul-sound.com/   Check our Bright Side podcast on Spotify and leave a positive review! https://open.spotify.com/show/0hUkPxD34jRLrMrJux4VxV   Subscribe to Bright Side: https://goo.gl/rQTJZz ---------------------------------------------------------------------------------------- Our Social Media: Facebook: https://www.facebook.com/brightside Instagram: https://www.instagram.com/brightside.official TikTok: https://www.tiktok.com/@brightside.official?lang=en   Stock materials (photos, footages and other): https://www.depositphotos.com https://www.shutterstock.com https://www.eastnews.ru ----------------------------------------------------------------------------------------  For more videos and articles visit: http://www.brightside.me  ---------------------------------------------------------------------------------------- This video is made for entertainment purposes. We do not make any warranties about the completeness, safety and reliability. Any action you take upon the information in this video is strictly at your own risk, and we will not be liable for any damages or losses. It is the viewer's responsibility to use judgement, care and precaution if you plan to replicate.

Transcript

00:00A doctor is about to perform a surgery.

00:03He positions the lamp over the patient and… wait, what?

00:07His hand doesn't cast a shadow.

00:09And it shouldn't, because even one little dark spot could ruin a life-saving operation.

00:16This magic happens thanks to a large number of light bulbs.

00:20Each LED shines on the patient from a different angle, creating overlapping patterns.

00:25A sensor detects any obstacles and compensates for shadows by dimming some LEDs and increasing

00:31the output of the others.

00:34Harry Potter's Invisibility Cloak is now a reality… well, sort of.

00:39Meet Metamaterial, a futuristic fishnet that can make things invisible by manipulating

00:44electromagnetic waves.

00:46What happens is that when light hits an object, it either gets absorbed or bounces back.

00:52Either way, it makes the object visible.

00:55With Metamaterial, instead of absorbing or reflecting light, it bends it around objects,

01:01making them invisible to the unaided eye.

01:03The bad news is that, for now, it only works with specific wavelengths of light, like radio

01:09waves.

01:10So this Invisibility Cloak doesn't work with visible light, the things we can actually

01:14see just yet.

01:17In Sweden, two women managed to create an invisible bike helmet.

01:22Well, okay, maybe not that invisible since you have to wear this thing around your neck

01:26for it to work.

01:28This neck piece has a sensor with a special algorithm that can distinguish between regular

01:32biking and a crash.

01:34So if a cyclist is wearing this and gets into an accident, the sensor automatically activates

01:40and inflates the neck piece with cold helium gas, instantly deploying the helmet that looks

01:45like a head airbag.

01:47And if you're worried about the helmet tearing after hitting the ground, don't be.

01:51It's made of super strong nylon fabric designed to handle pretty much any strong impact.

01:57Well, it seems we're not quite masters of invisibility yet, but transparency is a different

02:04story.

02:05Back in the 90s, a botanist in Germany managed to create a see-through wood.

02:10This invention was almost forgotten for decades, but recently, a group of researchers upgraded

02:15the material to make it tougher than glass.

02:19Regular wood is like a bundle of tiny straws held together by a natural glue called lignin,

02:25which gives it strength and color.

02:27To make wood transparent, scientists remove or bleach lignin, leaving a white, skeleton-like

02:33structure.

02:34Then, they fill these cells with a clear substance like epoxy resin, making the wood see-through.

02:41But don't worry, you won't be walking into forests full of invisible trees anytime soon.

02:46The idea is to use this technology to create things that need to be tough, like windows

02:51and smartphone screens.

02:54Seeing things that aren't really there like holograms is seriously bizarre.

02:58This technology is basically like watching 3D images of real objects, but without the

03:03need to put on those old-school 3D glasses.

03:07To create a hologram of a flower, for example, you start by pointing a laser at a special

03:12mirror.

03:13This process will split the laser beam into two parts.

03:17One part bounces off another mirror, illuminates the flower, and then hits a photographic plate.

03:23The other part of the beam bounces off a different mirror and goes straight onto the same photographic

03:28plate.

03:29When these two beams come together, they make a 3D picture of the flower.

03:33So basically, a hologram is an optical illusion of epic proportion.

03:41Levitation is probably the greatest magic trick of all time.

03:45While magicians typically use optical illusions to make things appear to rise and hover in

03:49the air, science can actually achieve it in the real world.

03:54A process known as quantum levitation allows materials known as superconductors to float

04:00above magnets.

04:01You see, these materials naturally repel magnetic fields, but some allow a few magnetic lines

04:08to pass through.

04:09This creates tiny vortices where magnetic flux can pass, helping the superconductor

04:15remain suspended, kind of locked in the middle of the magnetic field, defying gravity.

04:23Last year, outfits that changed colors and patterns right before our eyes went viral.

04:29This incredible fashion trick was achieved using photochromic materials.

04:34When this type of fabric is exposed to sunlight, UV radiation causes electrons to transfer

04:39between different states, which alter their optical and electrical properties.

04:44In simple words, they change colors.

04:47Since natural sunlight intensity varies all the time, the colors of the outfits also shift

04:52constantly.

04:53Unfortunately, the effect only lasts for about three minutes.

04:58Sure, you might wear something that changes colors, but would you eat it?

05:03I'm not talking about a banana ripening from green to yellow.

05:06I'm talking about chameleon, an ice cream made in a lab that tastes like Tutti Frutti

05:12and has a superpower.

05:14It changes color in your mouth.

05:16This treat shifts from lavender blue to pink upon touching your tongue.

05:21Although the physicist who invented it is pretty secretive about the recipe, we do know

05:25that the magic comes from how the treat reacts to changes in temperature and acids in your

05:30mouth.

05:31Oh, and the inventor also mentioned you can spray something he calls love elixir onto

05:37the ice cream to speed up the reaction.

05:40Science has advanced to the point where we can actually make it rain and snow.

05:45This technique is called cloud seeding, and although it might seem like an X-Men superpower,

05:50it is pretty easy to understand how it works.

05:53First, the weather needs to be cloudy.

05:56Once a cloud forms, workers at a control center send a plane to the area to stimulate rainfall.

06:02As soon as the brave pilot enters the cloud, the plane releases tiny particles such as

06:07silver iodide into the air.

06:10These particles help water droplets form and grow, which produces rain.

06:14Sounds simple, right?

06:16But playing Storm is pricey.

06:19An average 4-hour operation that seeds 24-hour clouds would cost around $5,000.

06:26If the storm gets too loud, just grab your noise-canceling headphones for some quiet

06:30time.

06:31These magical gadgets work by listening to the noises around you.

06:35Then their built-in microphones create sound waves that are the opposite.

06:39When these opposite sound waves mix with the noise, they cancel each other out, making

06:43everything quieter and clearer.

06:46Concrete often has a problem.

06:48It cracks, which makes it less durable, and that's not good.

06:52So the smart move is to go for self-healing concrete.

06:55This magical material has tiny capsules, or nanotubes, inside that are filled with healing

07:01agents like calcium carbonate.

07:04When a crack forms and hits these capsules, they burst open from pressure or moisture

07:08exposure.

07:10This releases the healing agent into the crack, where it mixes with things in the air like

07:14water or carbon dioxide, to toughen up the concrete again.

07:19If you're planning to build a house, you should consider using a 3D printer.

07:24I know it might sound crazy, but nowadays, it's completely possible to print an entire

07:29500-square-foot house in just 24 hours.

07:33It kind of works the same way as a regular 3D printer.

07:36First, you design the house plans on a computer.

07:39Then you send it to print.

07:41That's when colossal robotic arms come into play, laying down layers and layers of a special

07:47concrete mixture that harden as they go.

07:51Magic sand may look like an innocent toy, but it defies logic.

07:56I mean, it is sand that remains dry even underwater.

08:00But here's how it works.

08:02The sand is coated with a hydrophobic compound, which causes the grains to stick together

08:08and form cylinders when submerged in water.

08:11So if you put the sand in an aquarium, for instance, this compound will create an air

08:15pocket around the sand, keeping it completely dry.

08:20Talking about toys, did you have a boomerang when you were young?

08:24It is pretty fascinating how it always comes back into your hand.

08:28The trick behind it lies in its L-shape.

08:31A boomerang is designed with two or more wings positioned in a special way so that when it

08:37spins, it generates unbalanced aerodynamic forces that curve its path into an ellipse,

08:43allowing it to return to the spot from which it was thrown.

08:47Of course, this only works when it's thrown correctly.

08:50So maybe it's better to avoid using it altogether, especially inside your house.

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