nostr:npub167hem6ju6vx27h48n8jauezrfjktmarxnuy5pxx0kt6aufn36apqqy0399 nostr:npub1gxv4vcqfp2ug07fd34t0swq4w2t9gsynu0cmelr6ktcna8xnv38qythh99 to familiarize the young human resources with the “how long is time” concept my keeper picked this cool time piece up. They look at the sand as it falls and they get a sense of how long 1 min 3 min and 5 minutes are.