As you were helping him cross the street, a fellow pedestrian suddenly stumbled into your path. Without any signal from you, Roger jumped back to avoid hitting the other person. If Roger is blind, how could he have reacted this way?

2. Pummelo

It may look like a giant grapefruit, but the pummelo is more than meets the eye. Hailing from Asia, the super-sized fruit has an ultra-thick skin that gives way to a fresh, citrusy flesh. Sweeter than your typical grapefruit, this widely-available gem makes a great breakfast side, salad