Ashful
Minister of Fire
Females have more color receptors. Males have more black and white receptors. The trade off for less color sensitivity is ultimate sensitivity. Men don't need to use a flashlight to get to the bathroom at night.
Always let her pick out the paint color.
Rods and cones. Remember your psyc101 material, folks.
Females have higher cone count = better color differentiation. Males have higher rod count = better low-light ability.