What’s a transistor and why are they the most influential invention of the 20th century? Which Hollywood star laid the groundwork for modern Wi-Fi? How do aeroplanes get off the ground? Kaih, Catriona and Karla talk inventions on Radio Sci-Lens.

Bringing science into focus 5pm Fridays on Radio Fodder (radiofodder.com).

Follow us on Twitter @radioscilens.