Questions with the keyword 'perception'

• What causes a rainbow? by yooda to Bob, Katie, Nisha, Sallie, Vee Comments: (No comments so far )
• Why do stars twinkle? by yooda to Bob, Katie, Nisha, Sallie, Vee Comments: (No comments so far )
• why is the earth flat, but looks round from outer space by yolo98 to Bob, Katie, Nisha, Sallie, Vee Comments: (No comments so far )