can grados be taken out in public or would they be well heard by everyone around you? in other words can i take them to school or should i get some closed ones?
Full-sized cans, even ones as diminutive as the SR80s, are not all that fashionable. If I were a kid thinking of bringing mine to school, I'd want to give some thought to how I'd be scrutinized in that social pressure cooker we call high school.
Open-air cans are also less effective in noisy environments because they don't offer sound isolation. That said, I don't agree with all the talk about how worthless they are outside the house. I had a pair of SR80s (my first Grados) and I wore them everywhere - the beach, the lake, long walks, the doctor's office, the book store, you name it. While I wouldn't wear them while mowing the lawn or at a construction site, music covers up most outside sounds, or makes them easy to ignore, even at moderate levels.
Three places were a poor fit for all of my Grados: bed (because my wife likes it quiet, quiet when she sleeps); noisy vehicles (engine/traffic rumble cancels out the bass) and places where the ambient music is turned up loud (I took my five-year-old to a fun palace and let her run around while I worked on my computer; on days when the music was kicked up, I found my open-air headphones ineffective).
You shouldn't try to compete with noisy environments, where you'd have to turn your headphones up. The process of drowning out the outside noise forces you to turn up your sound to unhealthy levels. Where the outside sound is that high, you need something that gives you isolation. The best choice there is a good IEM. But most outside environments are not that loud and you can easily get away with open phones practically everywhere.