1.
1. campfire
2. wheel
3. thunder
4.phone
5. old papers
2.
I think life before these things was a lot harder beacuse, for example without phone you can't search something you need to know/do. It is much easier now with these things beacuse we can manage our life easier.
3.
I don't really think that science helps people these days beacuse we don't have where to use it.