Technically the first two are still true... No one has seen the edge of the earth because a sphere has no edge. No humans have ever flown, although we have crea

Technically the first two are still true... No one has seen the edge of the earth because a sphere has no edge. No humans have ever flown, although we have created metal machines to do and when we pilot one of those we call it flying, which is sort of like calling piloting a mecha walking.