Given two cubes of the same size, you can drill a hole th... | funfact.wiki | funfact.wiki
Given two cubes of the same size, you can drill a hole through one and pass the other through it. By drilling parallel to the space diagonal, a cube about 6% larger than the original can pass through. This is known as the 'Rupert property.'
In the 1982 SAT, only 3 of 300,000 students answered a circle rotation problem correctly. Even the test makers were wrong, and the correct answer was not among the choices. The key is the coin rotation paradox: a circle rolling around an equal circle makes 2 full turns, not 1.
The "Rule of 72" lets you quickly estimate compound interest. Divide 72 by the interest rate to find how many years it takes to double your money. At 6% annual return, 72 ÷ 6 ≈ 12 years to double. The actual result is 2.012×—remarkably accurate.