crisps vs. chips

my sister loves potatoes - mashed potatoes, french fries, potato chips.  i mean, everyone loves these foods, but becky LOVES these foods.  we talked on the phone yesterday and i gave her a quiz - what does this british word mean in american english?  in addition to words like "loo" and "courgette" and "ta," i found myself giving her all the words for various potato products, totally on accident.  after "crisps" and "chips" and "mash," she said to me, "ooh these are very important words for me to know" and we both laughed a lot.  one thing i have really enjoyed in england is going into the grocery store and just walking the aisles.  in a nice grocery store like marks and spencer i can spend a lot of time looking at sandwiches and cheeses and desserts and crisps and noticing the differences in the food between british grocery stores and american grocery stores and trying something new.  getting sandwiches and crisps from a grocery store is definitely something we will be doing when my family comes over in lessthantwoweeks.  is this dorky?  probably.  but i've already looked to see if there is an m&s in edinburgh, and there is.  and i'm excited.