Hyrdrogen is extremely flameable and to be used as a fuel it would be very unstable and if a spark happened it could cause a large impact around you. If you read about supernovas thats how they happen alot of the time. Although petrol is avaliable atm.
Current theorys explain that things can be held in suspended anamation with a simple formula so somone can actually create a star and then when the Sun dies out we will all have a small star to keep in our homes as a fuel for most things including light, it wont burn as by keeping it suspended it will produce enough heat and we will constantly have daylight unless we lock the star away. This theory isn't hard to belive if you have a large view on the solar system as it is actually possiable to make a small scale star die on earth whenever we like with a large laser.
Stars need large amounts of gravity to keep themselves stable and not explode. If the star was in a house it couldnt keep itself contained and would explode. Sure we could make some sort of container for it but it would still be incredibly dangerous.
I prefer zero point energy. Basicly we would be pulling energy from the universe itself (or an alternate one to be more safe) This would be alot safer but probably be more difficult to do.
Flying cars are easy to do, all you need to do is create enough thrust to lift off the ground. As aircraft engines increase creating even more thrust and material weight decrease will will eventually be easy to do. The problem is controling them, if humans tried to control one fully it would most likely craft into things. Large aircraft are hard enough but are stable because of there size, even though they do have alot of terbalence at times. So it will all be controlled by computers, plug in your destination and wait
I personally think the biggest thing will be us turning into a race of cyborgs. As computers increase in complexity, when they can design themselves fully and keep doing it increasing there speed. They will become ALOT smarter than us. Humans being humans will get scared and try to stop them, computers being smarter, stronger and more resilient will beat us.
How i see it we have two choices, stop advancing computers and become stagnent. Most increases in...everything? in the passed what 30 years have been computer based. Just stopping would make us become stagnent and just wouldnt work. Or we could incorarate computers into ourselves, become cyborgs. Im personally all for it, being able to download information into our minds, being able to *talk* to people wirelessly, increased strength speed. Deseases will become computer viruses and biological ones will be cured by nanobots. Essensially we will hopefully become the borg, try to advance ourselves by absorbing new information from other species.
