Is the sky really blue? Can we change our sense of taste with single word? Can we experience more than five senses?
There's a group of scientists out there who are entertaining these questions in their quest to figure out if humans can engineer different perceptual experiences.
Kara Platoni, science journalist and the author of We Have the Technology: How Biohackers, Foodies, Physicians, and Scientists Are Transforming Human Perception, One Sense at a Time (Basic Books, 2015), offers a guide to all the ways science is "hacking" human perception -- from new tastes to new limbs to treating PTSD.