1. Aspirin can cure a headache, but when you pop an aspirin tablet, how does the aspirin know to go to your head rather than to your big toe? 2. Which is better for you—a drug that is a natural...

1. Aspirin can cure a headache, but when you pop an aspirin tablet, how does the aspirin know to go to your head rather than to your big toe?

2. Which is better for you—a drug that is a natural product or one that is synthetic?

3. Would you expect polypropylene to be denser or less dense than low-density polyethylene? Why?