If you throw me out the window, you’ll leave a grieving wife, but drop me in the middle of a door, and you might just save a life. What am I?

I’m born when giants meet their end, yet even light can’t escape my bend. I warp both time and stretch out space, with singularity at my base. No surface have I, no solid face, but cross my edge and there’s no retrace.

The more you spend on me, the more I can give back. I can build people's futures or I can break their backs. What am I?

As I was going to St Ives, I met a man with seven wives. Each wife had seven sacks, each sack had seven cats, each cat had seven kits. Kits, cats, sacks, wives How many going to St Ives?

The more you know the faster I get, I'm said to be bliss, I do not excuse you from the law