
Most people assume everyone sees the same world. But a small number of women — tetrachromats — perceive up to 99 million colours the rest of us can’t see, detect, or even imagine. The science behind this extraordinary quirk of genetics is stranger, and more philosophically unsettling, than it first appears. Read more

Experience what truly happens to the human body in space as gravity disappears and every system begins to adapt. From fluid shifts and muscle loss to vision changes and radiation exposure, this detailed explanation reveals how space transforms the body and challenges human survival beyond Earth’s natural environment. Read more