Las Vegas plays host to CES - one of the biggest consumer tech trade shows in the world. Alasdair Keane is there for Tech Life, reporting on the latest innovations and devices. Also, video gaming is big business in Africa. Tech Life presenter Shiona McCallum finds out how big the business is. And a new substance has been discovered which could solve a problem with rechargeable batteries.PHOTO CREDIT: Sphere, Las Vegas. Greg Doherty/Getty Images (Sphere is featured in this week's edition of Tech Life)