Amsterdam during the Second World War?
Working out: 6.25% = 4 half lives (20x4=80ma) 80ma is how old the rock is
This poem is about how Louis Simpson is looking for loved one. Through out the entire text he expresses his loss for hope and courage, questioning whether not he should live and love of his departed, and he has tremendous fears of losing his precious memories of his loved one.
Be brief.
Proofread your message.
Seek other ways to relay your message.
Don't know the fourth one but hopefully that eliminates some of the answers.