User blog comment:MachineGunSuper/Supertasks/@comment-31966679-20180826024816

Try doing the cutting the cake one. You can't, because it takes time to cut a cake in half.

So, if it takes 1 second to cut a cake, then:

count to 29 then cut the cake, it will take 30 seconds in total.

count to 14 then cut the cake, it will take 15 seconds.

Then count to 6.5,

then count to 2.75,

then count to 0.875

then count to -0.0625.

Wait! You can't count to a negative number!

The reason why it does result in a negative number is because you had to cut the cake in 0.9375 seconds, but it takes you 1 second to cut a cake!

Same with computers. They may seem instant, but really, they take 1 millionth of a second to run 1 command.

Formulas for calculating pi take many, many instructions, so it takes up roughly 0.1 seconds per iteration.

So eventually, the computer wouldn't be fast enough.

Hope this helped!