Recognize the TV shows?

Okay...I saw this show a long time back its based on a world in the
future ppl have very small lifespans and there is only one company in
the world called nexus

Another show where 2 kids have a machine that can bring ppl from the
past to the prsent

Also another show where whatecer book he reads he can go inside of it

Do you recognise any of these??