Science gives you good problem solving skills and teaches you to be sceptical and know when to trust evidence. If you do science there are lots of jobs available to you that otherwise might not be because these skills and maths and explaining skills are useful in many jobs
You would need to introduce a list.
For example you could have: My shopping list contains of; milk, bread, and yogurt.
Another purpose is to separate clauses.
'Nobody' is basically contracted in itself, I don't believe you can decrease the word further.
