Time travel
One of humanity’s last scientific goals to achieve is the one at the center of Back to the Future: Travelling through time. Although we would have found out by now if it was ever going to be possible, we can still dream about what moments in time or events we would like to visit in the past.
For perspective, this black and white picture was taken in the late 1940s. It may not seem like an extraordinary photograph until you see the odd man out on the right. He is wearing a printed t-shirt and wearing sunglasses from a different time. Never mind the modern-looking camera.