Translation of wahnsinnig

Today the spring really showed itself. It was over eighteen degrees and people started wearing nice and with T-shirts. Snow has melted and the temperature is steady. I can't wait for the summer.
Unfortunately, it is a natural and eternal phenomenon of human beings. Whereever people have been, it appeared too. Please let me define racism in my next email to you and please share also your thoughts.
On the way we visited many small hill tribe villages. The walk was through green, wet rice fields. We really enjoyed it. Our guide explained us about the region and taught us some Vietnamese.