Let me tell you about something wild happening in medicine right now. Scientists are working on materials that can change shape inside your body. It’s called 4D printing, and it might just fix some of the biggest problems in healthcare. Think about a kid who needs a heart implant. Right now, if that child grows, they’ll need more surgeries to replace the implant as their body changes. But what if the implant could grow with them? That’s the kind of thing 4D printing could make possible. They’re made from smart materials that react to things like body heat, moisture, or even light. After they’re put inside you, they can bend, expand, or even dissolve on their own when they’re no longer needed. Take something as simple as a bandage. Right now, you stick it on a wound and hope for the best. But imagine one that tightens as the wound heals, giving just the right amount of pressure at each stage. Or a tiny drug capsule that stays closed until it reaches the exact spot...
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