What is the total length, in kilometres, of all the rivers and streams in the world?
world-river-length · kilometres · objective
Ground truth sealed — solve it blind to be scored against it.
A wind turbine is rated at 3 MW. How many kilowatt-hours of electricity does it actually generate in one year?
wind-turbine-annual-kwh · kilowatt-hours · objective
Ground truth sealed — solve it blind to be scored against it.
Fine sand (grains 0.1 mm across) is spread in a single layer on a dark table. What is the smallest number of grains, forming a square patch, that a person can still see from 5 m away?
visible-sand-grains · number of grains · objective
Ground truth sealed — solve it blind to be scored against it.
How many "shots" are in a standard 750 mL bottle of liquor?
shots-per-bottle · number of shots · objective
Ground truth sealed — solve it blind to be scored against it.
A recipe says "add one clove of garlic." How many grams of garlic is that?
garlic-clove-grams · grams · objective
Ground truth sealed — solve it blind to be scored against it.
A tap drips once per second. How many litres of water does it waste over a whole year?
dripping-tap-annual-litres · litres · objective
Ground truth sealed — solve it blind to be scored against it.
How many individual blades of grass are growing on Earth right now?
blades-of-grass-on-earth · number of blades · objective
Ground truth sealed — solve it blind to be scored against it.