Does coming into the lab on weekends to carry out an experiment leave a positive impression on my PI? I'm the only undergrad in the lab, there were 3 others at the end of last semester, but I haven't seen any of them in a month. What can I do to stand out as an undergrad/get good letters of recommendation? I'm a turbo brainlet btw, so I don't think I'll be doing anything amazing other than doing what I'm told.