Give me a place to stand and with a lever (and some algebra) I will move the whole world.
Save time with this clever thinking.
Puzzles that are like Sudoku, but trickier!
The unification of logic and algebra.
Sometimes x is unknown, and sometimes it's unknowable.
If 4 cows make 4 gallons of milk in 4 days, how much milk do 8 cows make in 8 days?
A powerful language for the very large and the very small.
2, 5, 10, 17, 26... What comes next?
Mostly, we just want to see the collisions!
Bang! Now it's huge!