Doctors Chris and Xand van Tulleken put competing health theories to the test with the help of 30 other pairs of identical twins.

Chris van Tulleken
Himself - Presenter

Xand van Tulleken
Himself - Presenter

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This episode explores the best way to get fit, beat nausea, and discovers if you can enhance brain performance.
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Twins test the best way to beat fatigue and discover the effect of smartphones on IQ.