In this week's episode of RAZOR we find out how nuclear fusion could provide an unlimited supply of clean energy and explore the radical use of bacteriophages to treat brain cancer.

In the south of France, an international collaboration of scientists is trying to achieve that by recreating the power of the sun, right here on earth. ITER, which is latin for "the way," will be the largest nuclear fusion experiment in the world, once construction is complete.

Thirty-five countries from around the world have come together to create a sustainable fusion reaction, designed to produce more energy than it consumes. The fusion reaction is created inside a containment vessel known as a Tokamak, built to hold plasmas hotter than those found in the sun.

ITER plans to begin its fusion experiments in 2025. Right now – it's a giant construction project - but RAZOR reporter Shini Somara gets a look behind the scenes.

In London, Emma Keeling meets Professor Hajitou, who has been working for 12 years on a cancer treatment using bacteriophage therapy. Bacteriophages are the most abundant and diverse microbes found in the body. But the property that makes them especially interesting is that they can cross the blood brain barrier.