James May discovers just how far he can push his body, and explores some of
the most remarkable me...

James May discovers just how far he can push his body, and explores some of
the most remarkable medical advances over the last hundred years.

He begins by testing himself in a centrifuge - a devilish machine that is
used to train fighter pilots and astronauts. As the pace picks up and the
'g-forces' increase, he dramatically passes out.

Then James is invited to watch open heart surgery - where a man's heart
stops beating in the middle of an operation. Fortunately, it is all part of
the procedure to fit an artificial heart.

But his biggest surprise came when he investigates the 20th century's
greatest medical breakthrough - the discovery of DNA. James has his DNA
tested, only to discover that he's not quite as English as he's always
assumed.