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Not Another NAND!

Prove that you can make any type of logic gate using just NAND gates.

Advanced STEM

This collection of resources is designed for developing STEM at Post-16.

Core Scientific Mathematics

This is the area of the advanced stemNRICH site devoted to the core applied mathematics underlying the sciences.

Stonehenge Is Going Nowhere

Age 14 to 16 Challenge Level:
Like Stonehenge 1, this is an exercise in having a feel for mechanics.

One way to think about this one is that when you push the stone from left to right, the top layer of logs wants to move clockwise, and from left to right. The bottom layer of logs then wants to move anti-clockwise, and from right to left. However the bottom layer cannot move left since the logs on the top layer are going right.