How to make a cloud in a bottle; an educator shows how she swabs frogs to make sure their skin and environment is healthy and safe for them; a roboticist combines her passion for origami with robotics; the types of microbes existing in caves.

The four Cs of diamond grading; how vitamins are made; how the bacteria in the gut can affect the brain's ability to function; 3D printing and a printer big enough to print a car.