"I noticed that the back of my siddur contains a large section devoted to selichos for the 20th of Sivan, yet I have never davened in a shul that observed this day. What does this date commemorate?"
The laws of Birkat Shehechiyanu, which comes first Shehechiyanu or the blessing on the food? reciting the Shehechiyanu on house renovations and on similar fruits, reciting the Shehechiyanu on a Mitzva, the first time lighting candles.
How can we understand the rebellion against religion over the past century? What does the world gain spiritually from this rebellion which was foreseen in the mishna 1,800 years ago as part of the period preceding the mashiach? Only after we understand the rebellion can we glean the benefit and relate to our brothers properly.