making a difference. and here are some of this year's highlights. first up, click met 0lympic medallistjessica ennis—hill to find out about her fitness appjennis, helping women train around their cycle. the way the app works is that you can input your period data to find out what phase of the cycle you are in. it then gives you tailored fitness options to suit your energy levels at any given time of the month. i think that maybe if i would've spent more time understanding particularly when to push myself in the strength room, for example, in that follicular phase, then perhaps i would have built more lean muscle and become stronger, and, who knows, that may have affected my performance in a positive way. we went to the netherlands to visit pauline van dongen. she creates textiles with solar cells woven into them. her idea is that these fabrics are a more tactile way for people to interact with the sun and its energy.