The physics that make roller coasters a fun ride; Michelle Barboza makes bismuth crystals; an engineer who makes machinery more reliable; a chemical engineer who wants to put human tissue on a microchip.

An animal care curator shows us how she's helping to conserve small desert cat populations. Dr. Brain reveals why you sometimes see faces in inanimate objects. Then, we get crafty – building morse code robots! And we meet a textile engineer who's making the sustainable fabric of the future.