Have you heard about those giant wasps that are "invading" the US?

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I read something about these big wasps that have been showing up in various places in the US. The were actually calling them hornets, but I don't now what the difference is. I Googled some pictures, and they looked like big yellow jackets to me. Apparently their sting is powerful enough to kill a human IF enough of them swarm you. I had one in my house the other day. He (or she) about 1 1/2" long! I shooed the critter outside and then tracked it to a railing on the way down from my apartment where a nest was being built. I called management and told them about the next. They suggested I spray the next with bug spray. I realized all I had was ant killer, and the last thing I wanted to do was make a bunch of giant wasps mad at me. I called management back and asked if they had any dedicated bee and wasp spray. "Domingo came by later in the day and we saturated the nest with his more powerful stuff. It worked. The dying wasps back out and fell to the ground beneath the nest. The nest is kind of pretty, but I didn't want It to get bigger and bigger and then accidentally bump into it while carrying groceries or my bike up. I hope I don't get victimized by the Bug Gods or Bug Karma. I'm usually nice to insects. Hove you heard anything about these wee critters?