The best bicycle is generally one that fits your body and riding style. Check out the excellent essay on frame sizing by Sheldon Brown in related links.
A tandem bicycle features two people riding on the same frame with two seats. The first recorded tandem bicycle was created in 1898 by Mikael Pederson.
Yes, because you don't inherit the skill of riding a bicycle.
you will be riding a bicycle
I am not riding
A bicycle
That's all down to how hard you're riding. Most people will use more effort when riding IRL than riding stationary bikes.
poop
A bicycle helmet is a piece of protective headgear intended to be worn while riding a bicycle.
diamondback is a good bicycle for cruising, but not for extreme riding or jumping
You are not moving relative to the bicycle.
No.