Seems weird to me to include snapchat in a list together with antibiotics and cars. And I think it kind of demonstrates your own point. You did not name any sp

Seems weird to me to include snapchat in a list together with antibiotics and cars. And I think it kind of demonstrates your own point. You did not name any specific antibiotic products, or car manufacturers, because those are not really that significant. The underlying inventions though are the real technological leaps forward that, as you say, are like air: so common that we overlook them all the time. Snapchat is just a product, I think the real invention that you overlooked is the internet.