Why don't we build a perfect house in Earth's orbit? Peace and quiet. And zero natural disasters. Or place this huge Dyson hemisphere near the Sun and take our Solar System’s future into our own hands. Finally, what about a mega generator that draws infinite energy from a tamed black hole? All these space megastructure projects may seem to offer unique opportunities to us people. However, in this video, I'll tell you: why is reshaping Earth not a very good idea? How can we make a black hole even more dangerous? And what real space megastructure projects can turn out to be mega graves for humankind?