Translation of speculate in German

Thanks a lot. Today and tomorrow are holidays in Switzerland, but I'll do it Tuesday first thing in the morning...please have a look at it and confirm. Where do you want me to place a reference?
The image width is ideal on all pages except on the front page. The image width there is almost double. Why? The introduction text could be on the left side, cause that is where people start reading.
As soon as I went to bed, incredibly loud music starting playing from right beneath my room. The music was so loud that I could not fall asleep despite my jet lag and despite being extremely tired.