Community Tip - When posting, your subject should be specific and summarize your question. Here are some additional tips on asking a great question. X
"Бросая в воду камешки, смотри на круги, ими образуемые; иначе такое бросание будет пустою забавою."
"Throwing pebbles into the water, look at the ripples they form on the surface. Otherwise this activity will be an empty amusement."
One branch: