Is your mind like a sieve, or is it more like a sponge?

Question

Is your mind like a sieve, or is it more like a sponge?

Answer 1

A sponge, as well as some useful knowledge in there, there is also some random stuff that I don't really need to know.

Answer 2

It used to be a sponge ... but it leaks more as I get older.

Answer 3

More like a chalkboard...what's needed, stays...what isn't, or becomes outdated, gets erased. But sometimes I forget where stuff's written...