Our cell phones would be the most shocking to scientists of yesteryear. We have compressed such an immense amount of processing power in to a hand held device, that is extremely multi-functional. In as little as 30 years ago, the amount of storage found in a lower end smart phone (16 GB) would have taken up as much apace as a home or more. The number of calculations possible per second by our phones would have seemed impossible in only 30 years ago. To a scientist from a century ago they would seem almost like wizardry.
Also, another great post @pjheinz. Keep it up!
Excellent insight @justtryme90, we can agree smart-phones would fall under Clarks Third law: “Any sufficiently advanced technology is indistinguishable from magic.”
I also think THE INTERNET is something that no-one from the past could have ever predicted. It has changed the way we do just about Everything.