I think that there would not be modern medicine, so lots more people would be sick. There would not be cars or other energy technologies. We wouldn’t have sunscreens or computers! You and I wouldn’t even be talking over the Internet! Crazy?!
The first caveman to pick up a rock and try using it as a hammer tool was in his own way a scientist – he tried something new to see if it worked. If that characteristic wasn’t inherent in their nature, there probably wouldn’t be any modern people around today – we wouldn’t have evolved any further!
If we scientists all went missing off the face of the Earth right now – I reckon the world would slowly grind to a halt. 😉