On Free Cone Day, customers may redeem one small vanilla cone at participating Dairy Queen locations. Dip your cone for $1.

Blue cones develop earliest, followed by the morphologically indistinguishable green and red cones. 1 Researchers have debated if green and red cone determination is random or deliberate. Green cones ...

Their vision is similar to dogs, with limited ability to distinguish between reds and greens. They see blues and yellows but struggle with reds and greens. They lack cone cells for colour vision and ...