Bill Hammack - The Engineer Guy
Eric Chien
Tom and Jerry - Hungarian Rhapsody No.2 by Franz Liszt
Dinorwig Power Station, otherwise known as Electric Mountain, is a pumped-storage hydro station in Llanberis, Wales. And yes: it's Britain's largest battery. Here's how it works, and why some of the things you think you know about TV pickups might not be so true any more.