Yes, it was Albert Einstein who unified space and time together into a single, coherent whole. As a physicist I can say that was a pretty impressive feat, but as parent — slogging across interstate whatever on the last weekend of the summer — I have to ask: What's the big deal?
Anyone stuck in vacation traffic with kids in tow can tell you that Space and Time have always been unified but not in the wiggly, abstract sense my buddy Al Einstein was talking about.