I've been wondering about certain things and haven't been able to get the info anywhere.

1. When did McDonald's introduce McNuggets, Quarterpounder, Double Quarterpounder and its BigMac to the US market?

2. When did most cars in the US first start coming with radial tires and not bias ply.

3. When did cars first come with seat belts and headrests?

4.What was the most expensive model Mercedes imported into the US in 1970 and how much did it cost back then ?

5. When did coast to coast nonstop flights first start in the US?