Becoming ill in space can be a big deal so astronauts must be in tip top health before they get anywhere near a rocket. And once up in space, astronauts must exercise to stay in good condition. In the above video, the former NASA astronaut Mike Massimino explains the challenges of staying healthy in space – including unexpected problems like vibrations from exercise machines disturbing delicate zero-gravity experiments on the International Space Station.

This week we are running a Twitter poll that asks what you think physicists will have achieved by 2040. One option is commercial fusion energy, and one of the more unlikely proponents of this potential power source is a former star of the reality TV show Made in Chelsea. Previously seen swanning around bars and boutiques in the King’s Road, Richard Dinan is the founder of Pulsar Fusion – a private firm that is building a small-scale fusion reactor in the English countryside.

Now, Dinan is back in front of the camera in “Fusion: the power to change” (below). In this nicely-done video he visits the UK’s Culham Centre for Fusion Energy to watch the Joint European Torus fusion reactor in action. Dinan also travels to the next-generation ITER facility, which is currently under construction in France and meets scientists working there. Then, it’s back to the UK where we hear from a Pulsar Fusion scientist who is looking at how fusion could be used for space propulsion.

Will we have commercial fusion by 2040? Probably not, but that doesn’t mean that physicists shouldn’t be trying to gain a better understanding of how to create and control nuclear fusion for a range of applications.

As quantum technologies such as cryptography enter the mainstream its essential that the basics of quantum theory are taught in high schools. But how to imbue the subtleties of Bell’s inequalities on your average 17-year-old?

Andrea López-Incera, Andreas Hartmann and Wolfgang Dür at Austria’s University of Innsbruck think that games are the answer. In “Encrypt me! A game-based approach to Bell inequalities and quantum cryptography” they describe a game in which a class is divided in two, with half the students playing the role of quantum bits of information (qubits) and the other half playing the role of physicists making measurements on those qubits.

Now that might sound a bit boring, but making a measurement actually involves the physicists throwing balls at the qubits who try to avoid being hit. Sounds like fun.