Intelligent design is part of creationism which is a counter argument to evolution. Its belief is that we were designed and created by a god-like being in our present form including all plants and animals and states that species cannot become other species. Many feel that this different opinion should be taught in schools so that students hear both sides of the argument. Currently it shouldn’t because right now it’s more like “Unintelligent Design” since it has no concrete facts for it and many facts against it.
Flat Earth theory was disproved thousands of years ago, but even so, there are still people who still believe in a flat Earth. Some people who defend flat earth are just trolls, only wanting to pretend to believe. Others, however, truly believe the Earth is flat and we are being misled.