You've found yourself on earth, before the time most things have been invented. So we're talking about a world void of things like the internet, cars, hybrid fruit, weapons of mass destruction and cake.
You've got a couple of basics like fire and the wheel. Maybe even electricity if you got all whiney about it.
What would you invent?
Me, I think it would be hot water bottles. Possibly even baths. And I'd dream of showers, but I know the only way I'd be able to make them happen would be if I was also magic.
And even though I'd like to think I'd invent the umbrella, I am confident my hard drive would need a lot more gigs to pull that puppy off.
What would you invent ?