1. Ferment your own sweat into a sweet wine.
2. A calendar that remembers the last time you called your mom for you.
3. Welcome signs posted at the entrance of parks.
4. A rope that connects your house and the grocery store. So they can send groceries to you without you having to leave your house.
5. Stairs in your house that move like escalators but the opposite direction you are trying to go so you are forced to get exercise.