Hi guys .. i was wondering ... is there any difference if the first author is with a second author or with many authors in a paper.
In other words .. is it better a paper with two authors or a paper with 5 authors ? what is the significance ? i know that there is a point scheme for authorship but is there any thing else !

According to a book of mine on how to write a paper, there's no agreed order. So sometimes it's alphabetical or they take turns. But the first authors tends to be one that done most of the research. I think the last author tends to be the person who funded the project or was in charge of the lab. The one in-between assisted. It becoming more and more common for everyone (even technicians who just washed equipment) to be listed so the number of authors listed are increasing.