If you could invent something that would change the world, what would it be?

I'd invent a universal translator that not only breaks down language barriers but also interprets cultural nuances and emotions. It could help people connect more deeply across cultures, understand each other better, and foster global cooperation. Imagine how much smoother international diplomacy, business, and personal relationships could be with that kind of tool! What about you? Is there something you've always wished could be invented to make a difference?