Observation #1 «Time and memory»
I found that we know each other with my music teacher for 20 years already. 20 years! At that time I was as small as the girl in the foto. After 30 years people change a lot. People grow, get lost, find something, loose something, forget something. If people forget each other, they can meet each other as new people.
«Tак долго вместе прожили, что вновь
второе января пришлось на вторник,
что удивленно поднятая бровь,
как со стекла автомобиля — дворник,
с лица сгоняла смутную печаль,
незамутненной оставляя даль.»
I.Brodsky

Observation #2 «Charity Network»
How people are working in charity funds looks like spreading mechnisms in the networks:
if some fund cannot help a person, they spread the request further until the target is reached.