What walks on four legs in the morning, two legs in the afternoon & three legs at night?
The only thing I've heard of like this is the human life cycle. A baby walks on all fours, an adult walks on two legs, and a senior walks on two legs plus a cane, however I'm not sure how the morning, afternoon, and night thing fits in.
Ok I came up with this one in 5th grade. What was used long ago but has long since been forgotten. Can be flowing or solid; exists in the void of space and right here at home. What is it?
