22. Abi Barnes — CEO and cofounder of Allergy Amulet

Suffering with life-threatening allergies from a young age led Barnes to develop the Allergy Amulet: a portable device which can tell you whether a food contains certain allergens. With a law degree from Vermont Law School and a master's degree from Yale University, Barnes launched the device in 2018.

Simply swipe a single-use test strip over your food, insert your strip into the Amulet, and in a minute's time you'll have the result via an app on your phone. It's intended to make eating out a lot safer for those with allergies, and has been designed to look as good as it is practical.

Read more: This wearable allergy-detection strip could save your child's life