Take some weight off my shoulders

Walking upto school with a heavy backpack with laptop and notebooks makes me feel tired. Is there a small machine that can pull the a heavy bag up preveting weight to come on back n shoulder. Can use walking for energy source if its enough to push the bag up. I can pay a premium to make my walk to school better

One Trash Can for everything

I am new to US and very often I get confused with what trash will go where. There are different trash cans for plastics, paper and just 'trash'. But do we really need 3 separate containers for them. These wastes can be easily identifed into different categories and then automatically sorted out. Yes additional energy usage is an issue but at many locations, it can be driven by solar power.