In the Mishna, Shabbat 1:3, it states (amongst other things) that one should not delouse one's garments by candlelight on Shabbat (ולא יפלה את כליו... לאור הנר). The following mishna, however, states ...
Can you destroy a spider web on shabbos if you simply do not want it around (you consider it unseemly)?
1) Is there any way to check lettuce on Shabbos? 2) If the lettuce had been put into a liquid that kills the bugs before Shabbos, is there then a way to check it?