Just about everything I write has an estimation – however, I will just list ones that have significant estimations.

- Suppose you wanted to make a radioactive banana powered generator. How big would it be?
- How big would a solar powered drone need to be?
- Could you fix Atlanta’s broken freeway by making a ramp so that cars could jump the gap?
- How much power does it take to fly this real life Iron Man suit?
- What is the power needed for this giant skyscraper waterfall?
- Could the Tesla electric truck be solar powered?
- How fast was this shark moving when it jumped out of the water?
- How long would it take to reach the top of a mountain using a human-powered chairlift?
- How much energy would it take to move 1 meter depth of water to the top of he Antartica ice sheet?
- Does a solar eclipse change the Earth’s temperature?
- How many different songs can there be?
- How far back in time do you have to go such that my number of ancestors is equal to the human population?
- How much oil can we get from the Earth and how long will it last?
- How big of a battery would you need to run your house?
- Which is worth more, a penny or a single potato chip?
- Could you charge your smart watch by shaking it?
- How long would it take for the whole world to do the ice bucket challenge?
- How much cement has China used?
- If you filled this arena with water, how long would it take to drink?
- How many batteries would you need to cook a turkey?
- How far could this drug shooting cannon shoot?
- What if everyone jumped in a lake?
- How many leaves are on this tree?
- How much does it cost to power your Christmas lights?
- How much rain does the Mississippi river need to flow?
- How difficult is the human powered helicopter?
- Could you jump off a building (and survive) by using bubble wrap?
- Can bird poop crack a windshield?
- How big would a stack of 1 trillion dollars be?
- Could you charge your phone with sound?
- How much time does an airbag have between crash and deployment?
- How long would it take for one human to dig out this underground pool?