Yeah most of them I already knew but some surprised me. Even though some of these things are "safe" for dogs to eat , I wouldn't purposefully give them to my dog (tuna, pasta, popcorn). However, she does get fruit (no grapes) and veggies on a regular basis .
I knew apple seeds contain cyanide, although an adult human would have to eat about a cup of them to be fatally poisoned. A few people like that bitter-almond taste of apple seeds and have been poisoned when they ate too many without knowing they're actually toxic. I suppose the same is true with pears.