Does an organ donor need to be dead to donate a kidney?
Rationale first then the answer.
The average human has two kidneys. Only one kidney is required to function as a healthy person. Living organ donors will sometimes donate their spare kidney to someone experiencing failure of both their kidneys.. The answer is: no.

Would the tunnels at CERN fit onto the High Speed 1 rails?
Rationale first then the answer.
High Speed 1 (HS1), legally the Channel Tunnel Rail Link (CTRL), is a 67-mile (108 km) high-speed railway. The CERN collider is contained in a circular tunnel, with a circumference of 26.7 kilometres (16.6 mi). The circumference of a circle is the length of the enclosing boundary.. The answer is: yes.

Do members of NFL teams receive infantry training?
Rationale first then the answer.
Members of NFL teams play football. Infantry training is provided to members of the US armed forces.. The answer is: no.