Bell Work Index
- The most influential invention or discovery
- Weightless, visible, and makes a barrel of water lighter
- A slogan for your life
- Redesign a popular app
- How many lightbulbs are in the United States?
- Why are manhole covers round?
- How many tennis balls fit on a school bus?
- Pencil-sized and trapped in a blender — escape!
- Weigh an elephant without a scale
- Design a spice rack for a blind person
- How would you move the San Francisco Peaks?
- Explain the Internet to someone from the 1800s
- How would you test a calculator?
- Time travel: past or future?
- An everyday object due for a redesign
- Build a bridge from materials found in nature
- Invent a new household robot
- Build a clock without electricity or batteries
- Generate electricity without fossil fuels
- A car that never needs to refuel or recharge
- Technology that will be obsolete in 10 years
- Create a new programming language
- The hardest engineering challenges of a Mars colony
- A password system both memorable and hard to hack
- Technology that has done more harm than good
- Build a computer without silicon chips
- The most inefficient thing people do every day
- A world where AI makes all the decisions
- An app that makes learning engineering fun
- Deciphering an alien message in binary
- Generating power from human movement
- Design a completely self-sustaining city
- Add one bioengineered feature to the human body
- The Ship of Theseus: is it still the same ship?
- What to charge to wash every window in Flagstaff
- Why mirrors swap left and right but not up and down
- Find the heavy ball in two weighings
- The 60 mph average-speed puzzle
- Measure 45 minutes with two burning ropes
- Why do elevators have mirrors?
- Reverse-engineering a machine you can't open
- How many piano tuners are in Phoenix?
- How much does the Empire State Building weigh?
- Arizona's daily gasoline consumption
- Walking from Flagstaff to the Grand Canyon
- Ping pong balls to fill the Walkup Skydome
- The teleporter paradox: did you survive the trip?
- Who programs a self-driving car's crash choices?
- Is a simulated brain thinking or calculating?
- Buridan's robot: stuck between two chargers
- Design an alarm clock for someone who is deaf
- A week-long power outage at school
- Design a water bottle for airplane aid drops
- Cut the NPA car line wait time in half
- What should engineers copy from nature?
- Design a game for blind and sighted players together
- A tech norm future generations will find ridiculous
- Open-source one proprietary technology
- A machine left running for 100 years
- The human skill hardest to teach a robot