2. Sleep Deprivation

Twins test the best way to beat fatigue and discover the effect of smartphones on IQ.

3. HIIT versus Easy

This episode explores the best way to get fit, beat nausea, and discovers if you can enhance brain performance.

4. Better Brain

Twins find out if its possible to get a better brain, repel mosquitoes and get fit just by watching TV!

5. Giving Up Smoking

Identical twins put health theories to the test. Twins test the best way to kick a habit, see if hand-washing keeps you healthy and try to improve concentration.

6. Learn a Language

Identical twins test the best way to learn a new language, attempt to look younger and test an easy way to lower your calorie count.